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<h3>

Eric S. Raymond pushed to branch master

at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/06a3c85182f0a4674e2b8c4bb1d1018395615aae">06a3c851</a></strong>

<div>

<span>by Eric S. Raymond</span>

<i>at 2019-02-18T04:13:59Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More design work on NTPv5.

</pre>

</li>

</ul>

<h4>1 changed file:</h4>

<ul>

<li class="file-stats">

<a href="#9e6facf84d8e6ca6376177b93a71218f3632d443">

devel/ntpv5.adoc

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="9e6facf84d8e6ca6376177b93a71218f3632d443">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/06a3c85182f0a4674e2b8c4bb1d1018395615aae#9e6facf84d8e6ca6376177b93a71218f3632d443"><strong>devel/ntpv5.adoc</strong></a>

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">Why an NTPv5?  Why not muddle through with NTPv4?  The principal</span>

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">reason to avoid rollover cases in its time representation.  There is an</span>

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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">epoch turnover in 2036; it would be wise to have moved to full 64-bit</span>

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"><span class="idiff left right">timestamp</span>s well before we have to deal with uncharted parts of the</span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"><span class="idiff left right">date</span>s well before we have to deal with uncharted parts of the</span>

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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">software's behavior space.</span>

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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">NTPv4 is showing its age in other ways as well.  Its mechanism for</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -15,7 +15,32 @@ have vbeen observed in the wild.</td>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">There are various other functional capabilities that would be very</span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">useful if they could be standardized but currently are not.  Since</span>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">we need to deal with the 32-bit-counter issues anyway, the time</span>

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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">is right to design </span>

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">is right to design a protocol which (a) includes what we now know</span>

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">is needed, and (b) is extensible for future use.</span>

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">== Packet metaprotocol</span>

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">Every packet is led with a character '+'. This is chosen so that when</span>

</pre>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">a packet analyzer for NTPv4 looks the first byte, it sees 0x02B, which</span>

</pre>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">unpacks to LI:00 VN:5 MODE:3.  The version 5, which is out of band for</span>

</pre>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">an NTPv4 packet, will cause the packet to be rejected by conforming</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="27" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">NTPv4 implementations that do not handle v5.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">The Mills reference version of NTP and all codebases descended from</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="30" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext">it (including NTPSec) *do* recognize Version 5 as out of band</span>

</pre>

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext">and will not pass such packets to a Version 5 protocol machine.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">The remainder of the packet is encoded in a strict subset of JSON</span>

</pre>

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">intended to avoid known edge cases decribed in <<<Seriot16>>>.  The</span>

</pre>

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">outermost enclosing {} is required. Trailing commas on elements are</span>

</pre>

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">disallowed. UTF-8 may occur but only within string literals, all else</span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">must be 7-bit ASCII.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">In the remainder of this document, packet fields will be described as</span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">keyword-value pairs. The keyword *is* explicit in the JSON, and the</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">mapping is as implied in <<<RFC8259>>>.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext">The Appendix discusses some paths not taken and the reasons they weren't.</span>

</pre>

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19

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44

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

20

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<td class="diff-line-num new_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

45

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">== The missing data: a semantic view</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

21

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<td class="diff-line-num new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

46

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -63,87 +88,6 @@ from IERS and/or national time authorities to users.</td>

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<td class="diff-line-num old_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

63

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<td class="diff-line-num new_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

88

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

64

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<td class="diff-line-num new_line" data-linenumber="89" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

89

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">The new protocol needs to (continue to) support NTS extension fields.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="65" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

65

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<td class="diff-line-num new_line" data-linenumber="90" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

90

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="66" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

66

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext">== Extensions vs. replacement</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

67

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext">There are three possible scenarios for NTPv5 design.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

69

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="70" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

70

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext">=== NTPv4+</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

71

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="72" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC72" class="line" lang="plaintext">In this incremental approach, the NTP port number (123) is retained</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="73" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

73

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC73" class="line" lang="plaintext">and the 48-byte header v4 header is preserved. New data fields are</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

74

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">passed in RFC7822 extension blocks.  The NTP version number is</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="75" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

75

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext">not incremented; "v5" becomes a set of required extension blocks.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="76" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

76

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="77" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

77

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC77" class="line" lang="plaintext">There can be a way to unambiguously detect v5 packets.  The stratum</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="78" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC78" class="line" lang="plaintext">field is 8 bits, but only the low five bits are used.  We can mark</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="79" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC79" class="line" lang="plaintext">v5 packets by setting the high three bits.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC80" class="line" lang="plaintext"></span>

</pre>

</td>

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81

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext">A difficulty with this approach is that some firewalls and routers are</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="82" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

82

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC82" class="line" lang="plaintext">known to silently discard RFC7822 extension blocks as a way of</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="83" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

83

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC83" class="line" lang="plaintext">preventing DoS attacks. However, by checking the mark described in the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="84" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

84

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext">previous paragraph, an ntpd can at least detect this.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="85" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

85

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="86" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

86

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC86" class="line" lang="plaintext">=== NTPNG</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

87

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC87" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

88

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC88" class="line" lang="plaintext">In this approach, a new port number is allocated. The protocol</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="89" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

89

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext">design is unconstrained except that it must carry the semantic</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="90" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

90

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">content of the v4 header minus the unused Reference Timestamp</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

91

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC91" class="line" lang="plaintext">field.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="92" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

92

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC92" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

93

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC93" class="line" lang="plaintext">The principal difficulty with this approach is that getting all the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="94" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

94

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC94" class="line" lang="plaintext">world's firewalls to pass through a new port is not easy.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="95" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

95

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC95" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="96" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

96

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">=== Newmode</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="97" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

97

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC97" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="98" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

98

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext">In this approach, the NTP port number is retained.  So is at least</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="99" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

99

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">the first byte of the v4 packet header structure, so that the version</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

100

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC100" class="line" lang="plaintext">number and packet mode are at the same offset as in v4. The version</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

101

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC101" class="line" lang="plaintext">field *is* incremented to 5.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

102

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC102" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

103

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC103" class="line" lang="plaintext">The following payload design is unconstrained except that it must</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

104

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC104" class="line" lang="plaintext">carry the semantic content of the v4 header minus the unused Reference</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

105

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC105" class="line" lang="plaintext">Timestamp field.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

106

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC106" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

107

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC107" class="line" lang="plaintext">The principal difficulty with this approach is that implementations</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

108

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC108" class="line" lang="plaintext">might not reject Version 5 packets, and therefore mis-parse the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

109

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC109" class="line" lang="plaintext">header.  NTP Classic and NTPsec *do* perform this check.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

110

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC110" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

111

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC111" class="line" lang="plaintext">== Payload format design for the NTPNG and Newmode cases</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

112

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC112" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

113

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC113" class="line" lang="plaintext">NTP is running out of version numbers.  The version field is only 3</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

114

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC114" class="line" lang="plaintext">bits wide.  Accordingly, the Newmode payload should be structured like</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

115

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC115" class="line" lang="plaintext">PNG, as a sequence of self-describing chunks that can be retired and</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

116

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC116" class="line" lang="plaintext">replaced as needed to change payload semantics.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

117

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC117" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

118

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC118" class="line" lang="plaintext">Though NTPNG is not constrained by the width of the v4 mode field,</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

119

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC119" class="line" lang="plaintext">the versionless semantics of a PNG-style chunk stream would confer a</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="120" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

120

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC120" class="line" lang="plaintext">desirable degree of flexibility.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="121" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

121

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC121" class="line" lang="plaintext"></span>

</pre>

</td>

</tr>

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<td class="diff-line-num old old_line" data-linenumber="122" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

122

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC122" class="line" lang="plaintext">The PNG standard can be found at https://www.w3.org/TR/PNG/</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="123" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

123

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

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<pre style="margin: 0;">-<span id="LC123" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="124" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

124

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC124" class="line" lang="plaintext">A chunk system appropriate for NTP can be summarized as follows:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="125" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

125

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC125" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

126

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC126" class="line" lang="plaintext">* Each chunk begins with a four-octet big-endian length.  The length</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

127

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC127" class="line" lang="plaintext">  does not count itself.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

128

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC128" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

129

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC129" class="line" lang="plaintext">* Each chunk continues with a 4-octet type identifier composed of</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

130

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC130" class="line" lang="plaintext">  printable ASCII characters.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

131

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC131" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

132

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC132" class="line" lang="plaintext">* If the first character is uppercase, the chunk is *critical*; that</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

133

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC133" class="line" lang="plaintext">  is, implementations encountering a critical chunk type they do not</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

134

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC134" class="line" lang="plaintext">  recognize should treat the packet as erroneous.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

135

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC135" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

136

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC136" class="line" lang="plaintext">* If the first character is not uppercase, the chunk is non-critical</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

137

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC137" class="line" lang="plaintext">  and may be skipped.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

138

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC138" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

139

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC139" class="line" lang="plaintext">* Chunk content is not constrained and is interpreted based on the</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

140

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC140" class="line" lang="plaintext">  chunk type.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

141

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC141" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

142

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC142" class="line" lang="plaintext">Note that this is not identical to PNG chunk layout; one difference is</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="143" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

143

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC143" class="line" lang="plaintext">that PNG chunks have only two-byte lengths and always end with a CRC.</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="144" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

144

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<td class="diff-line-num new_line old" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC144" class="line" lang="plaintext">This chunk system is deliberately more similar to RFC7822 extension</span>

</pre>

</td>

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC145" class="line" lang="plaintext">blocks.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC146" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">== Daniel weighs in</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">There aren't many deficiencies in NTPv4 which can't be fixed by adding</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="297" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="241" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -297,6 +241,90 @@ such.</td>

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC241" class="line" lang="plaintext">...</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="298" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC242" class="line" lang="plaintext">----</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="299" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC243" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="244" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC244" class="line" lang="plaintext">== Appendix: Paths not taken</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="245" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC245" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="246" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC246" class="line" lang="plaintext">We chose a JSON-based metaprotocol to achieve the following qualities:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="247" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC247" class="line" lang="plaintext">(a) extensibility, (b) auditability by eyeball and simple tools, (c)</span>

</pre>

</td>

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<td class="diff-line-num new new_line" data-linenumber="248" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC248" class="line" lang="plaintext">avoidance of endianness or fixed-length issues in numeric</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="249" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC249" class="line" lang="plaintext">representations.</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="250" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC250" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC251" class="line" lang="plaintext">We chose *not* to optimize for least possible size of packet. In NTPv4</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC252" class="line" lang="plaintext">this was is a choice that doesn't age well. Data and transaction</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="253" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC253" class="line" lang="plaintext">volumes in real-world NTP service are low enough that the overhead</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC254" class="line" lang="plaintext">of JSON with respect to packed binary is quite affordable.</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="255" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC255" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="256" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC256" class="line" lang="plaintext">=== NTPv4+</span>

</pre>

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<pre style="margin: 0;">+<span id="LC257" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC258" class="line" lang="plaintext">In this incremental approach, the NTP port number (123) is retained</span>

</pre>

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<pre style="margin: 0;">+<span id="LC259" class="line" lang="plaintext">and the 48-byte header v4 header is preserved. New data fields are</span>

</pre>

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<pre style="margin: 0;">+<span id="LC260" class="line" lang="plaintext">passed in RFC7822 extension blocks.  The NTP version number is</span>

</pre>

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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext">not incremented; "v5" becomes a set of required extension blocks.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC263" class="line" lang="plaintext">There can be a way to unambiguously detect v5 packets.  The stratum</span>

</pre>

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<pre style="margin: 0;">+<span id="LC264" class="line" lang="plaintext">field is 8 bits, but only the low five bits are used.  We can mark</span>

</pre>

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<pre style="margin: 0;">+<span id="LC265" class="line" lang="plaintext">v5 packets by setting the high three bits.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext">A difficulty with this approach is that some firewalls and routers are</span>

</pre>

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<pre style="margin: 0;">+<span id="LC268" class="line" lang="plaintext">known to silently discard RFC7822 extension blocks as a way of</span>

</pre>

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<pre style="margin: 0;">+<span id="LC269" class="line" lang="plaintext">preventing DoS attacks. However, by checking the mark described in the</span>

</pre>

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<pre style="margin: 0;">+<span id="LC270" class="line" lang="plaintext">previous paragraph, an ntpd can at least detect this.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC271" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC272" class="line" lang="plaintext">=== NTPNG</span>

</pre>

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<pre style="margin: 0;">+<span id="LC273" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC274" class="line" lang="plaintext">In this approach, a new port number is allocated. The protocol</span>

</pre>

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="plaintext">design is unconstrained except that it must carry the semantic</span>

</pre>

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<pre style="margin: 0;">+<span id="LC276" class="line" lang="plaintext">content of the v4 header minus the unused Reference Timestamp field.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC277" class="line" lang="plaintext">The version field *is* incremented to 5.</span>

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<pre style="margin: 0;">+<span id="LC278" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC279" class="line" lang="plaintext">The principal difficulty with this approach is that getting all the</span>

</pre>

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<pre style="margin: 0;">+<span id="LC280" class="line" lang="plaintext">world's firewalls to pass through a new port is far from easy.  We</span>

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<pre style="margin: 0;">+<span id="LC281" class="line" lang="plaintext">rejected it on these grounds.</span>

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<pre style="margin: 0;">+<span id="LC282" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC283" class="line" lang="plaintext">== Payload format design for the NTPNG and Newmode cases</span>

</pre>

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<pre style="margin: 0;">+<span id="LC284" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC285" class="line" lang="plaintext">NTP is running out of version numbers.  The version field is only 3</span>

</pre>

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<pre style="margin: 0;">+<span id="LC286" class="line" lang="plaintext">bits wide.  Accordingly, the Newmode payload should be structured like</span>

</pre>

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<pre style="margin: 0;">+<span id="LC287" class="line" lang="plaintext">PNG, as a sequence of self-describing chunks that can be retired and</span>

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<pre style="margin: 0;">+<span id="LC288" class="line" lang="plaintext">replaced as needed to change payload semantics.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC289" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC290" class="line" lang="plaintext">Though NTPNG is not constrained by the width of the v4 mode field,</span>

</pre>

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<pre style="margin: 0;">+<span id="LC291" class="line" lang="plaintext">the versionless semantics of a PNG-style chunk stream would confer a</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="292" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC292" class="line" lang="plaintext">desirable degree of flexibility.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC293" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC294" class="line" lang="plaintext">The PNG standard can be found at https://www.w3.org/TR/PNG/</span>

</pre>

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<pre style="margin: 0;">+<span id="LC295" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC296" class="line" lang="plaintext">A chunk system appropriate for NTP can be summarized as follows:</span>

</pre>

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<pre style="margin: 0;">+<span id="LC297" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC298" class="line" lang="plaintext">* Each chunk begins with a four-octet big-endian length.  The length</span>

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<pre style="margin: 0;">+<span id="LC299" class="line" lang="plaintext">  does not count itself.</span>

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<pre style="margin: 0;">+<span id="LC300" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC301" class="line" lang="plaintext">* Each chunk continues with a 4-octet type identifier composed of</span>

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<pre style="margin: 0;">+<span id="LC302" class="line" lang="plaintext">  printable ASCII characters.</span>

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<pre style="margin: 0;">+<span id="LC303" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC304" class="line" lang="plaintext">* If the first character is uppercase, the chunk is *critical*; that</span>

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<pre style="margin: 0;">+<span id="LC305" class="line" lang="plaintext">  is, implementations encountering a critical chunk type they do not</span>

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<pre style="margin: 0;">+<span id="LC306" class="line" lang="plaintext">  recognize should treat the packet as erroneous.</span>

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<pre style="margin: 0;">+<span id="LC307" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC308" class="line" lang="plaintext">* If the first character is not uppercase, the chunk is non-critical</span>

</pre>

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<pre style="margin: 0;">+<span id="LC309" class="line" lang="plaintext">  and may be skipped.</span>

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<pre style="margin: 0;">+<span id="LC310" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC311" class="line" lang="plaintext">* Chunk content is not constrained and is interpreted based on the</span>

</pre>

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<pre style="margin: 0;">+<span id="LC312" class="line" lang="plaintext">  chunk type.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC313" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC314" class="line" lang="plaintext">Note that this is not identical to PNG chunk layout; one difference is</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="315" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC315" class="line" lang="plaintext">that PNG chunks have only two-byte lengths and always end with a CRC.</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="316" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC316" class="line" lang="plaintext">This chunk system is deliberately more similar to RFC7822 extension</span>

</pre>

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<pre style="margin: 0;">+<span id="LC317" class="line" lang="plaintext">blocks.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC318" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC319" class="line" lang="plaintext"></span>

</pre>

</td>

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</td>

<td class="diff-line-num new new_line" data-linenumber="320" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

320

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<pre style="margin: 0;">+<span id="LC320" class="line" lang="plaintext">== References</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="321" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

321

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC321" class="line" lang="plaintext">[bibiography]</span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="322" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

322

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC322" class="line" lang="plaintext"></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="323" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

323

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<pre style="margin: 0;">+<span id="LC323" class="line" lang="plaintext">- [[[Seriot2016]]] Seriot, Nicholas; "Parsing JSON is a Minefield"</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="324" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

324

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<pre style="margin: 0;">+<span id="LC324" class="line" lang="plaintext">  http://seriot.ch/parsing_json.php</span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="325" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

325

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<pre style="margin: 0;">+<span id="LC325" class="line" lang="plaintext"></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

326

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<pre style="margin: 0;">+<span id="LC326" class="line" lang="plaintext">- [[[RFC8259]]] https://tools.ietf.org/html/rfc8259[The JavaScript</span>

</pre>

</td>

</tr>

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<td class="diff-line-num new old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

327

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<pre style="margin: 0;">+<span id="LC327" class="line" lang="plaintext">  Object Notation (JSON) Data Interchange Format]</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="300" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

300

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<td class="diff-line-num new_line" data-linenumber="328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

328

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC328" class="line" lang="plaintext"></span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="301" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

301

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<td class="diff-line-num new_line" data-linenumber="329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

329

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC329" class="line" lang="plaintext">// end</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="302" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

302

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<td class="diff-line-num new_line" data-linenumber="330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

330

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<pre style="margin: 0;"> <span id="LC330" class="line" lang="plaintext"></span></pre>

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