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<h3>
Matt Selsky 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/74315ce76e78b49ca07bcd6293177473903577ac">74315ce7</a></strong>
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<span>by James Browning</span>
<i>at 2019-12-10T03:38:35Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">text revision
</pre>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/830ab8bb0fc45fe483ec2ebc72b74aaa98e18657">830ab8bb</a></strong>
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<span>by Richard Laager</span>
<i>at 2019-12-10T03:38:35Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revise more text in packet.py
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<h4>1 changed file:</h4>
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<a href="#e0397ae65951b0adbbedbbb14a096009aaa63642">
pylib/packet.py
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<h4>Changes:</h4>
<li id="e0397ae65951b0adbbedbbb14a096009aaa63642">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/d1795ae7f2f2b18540e8be3f256651a6b2dd078d...830ab8bb0fc45fe483ec2ebc72b74aaa98e18657#e0397ae65951b0adbbedbbb14a096009aaa63642"><strong>pylib/packet.py</strong></a>
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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">@@ -56,7 +56,7 @@ the general structure of an NTP packet (Figure 8):</td>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="python"><span class="s" style="color: #d14;"> | Key Identifier |</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="python"><span class="s" style="color: #d14;"> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="python"><span class="s" style="color: #d14;"> | |</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="python"><span class="s" style="color: #d14;"> | <span class="idiff left right"> dgst (128) </span> |</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="python"><span class="s" style="color: #d14;"> | <span class="idiff left right">digest (128)</span> |</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="python"><span class="s" style="color: #d14;"> | |</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="python"><span class="s" style="color: #d14;"> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="python"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="66" 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="66" 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">@@ -66,7 +66,7 @@ Stratum and all following fields zeroed out to byte 47.</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="python"><span class="s" style="color: #d14;">How to interpret these fields:</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="python"></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="python"><span class="s" style="color: #d14;"><span class="idiff left right">Mode is decoded</span> as follows:</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="python"><span class="s" style="color: #d14;"><span class="idiff left right">The modes are</span> as follows:</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="python"><span class="s" style="color: #d14;">+-------+--------------------------+</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="python"><span class="s" style="color: #d14;">| Value | Meaning |</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="82" 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>
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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">@@ -82,10 +82,10 @@ Mode is decoded as follows:</td>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="python"><span class="s" style="color: #d14;">+-------+--------------------------+</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="python"><span class="s" style="color: #d14;">While the Stratum field has 8 bytes, only values 0-16 (low 5 bits)</span></span>
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="python"><span class="s" style="color: #d14;">are legal. Value 16 means 'unsy<span class="idiff left right">chronized' Value</span> 17-255 are reserved.</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="python"><span class="s" style="color: #d14;">are legal. Value 16 means 'unsy<span class="idiff left right">nchronized' Values</span> 17-255 are reserved.</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="python"><span class="s" style="color: #d14;">LI (Leap Indicator), Version, Poll, and Precision are not described</span></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="python"><span class="s" style="color: #d14;">here; see RFC5905.</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="python"><span class="s" style="color: #d14;">here; see RFC<span class="idiff left right"> </span>5905.</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="python"><span class="s" style="color: #d14;">t_1, the origin timestamp, is the time according to the client at</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="python"><span class="s" style="color: #d14;">which the request was sent.</span></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">@@ -96,7 +96,7 @@ which the request was received.</td>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="python"><span class="s" style="color: #d14;">t_3, the transmit timestamp, is the time according to the server at</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="python"><span class="s" style="color: #d14;">which the reply was sent.</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="python"></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="python"><span class="s" style="color: #d14;">You also need t_4, the destination timestamp, is the time according to</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="python"><span class="s" style="color: #d14;">You also need t_4, the destination timestamp, <span class="idiff left right">which </span>is the time according to</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="python"><span class="s" style="color: #d14;">the client at which the reply was received. This is not in the reply packet,</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="python"><span class="s" style="color: #d14;">it's the packet receipt time collected by the client.</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="python"></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">@@ -107,14 +107,14 @@ most recent reference-clock.</td>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="python"><span class="s" style="color: #d14;">Theta is the thing we want to estimate: the offset between the server</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="python"><span class="s" style="color: #d14;">clock and the client clock. The sign convention is that theta is</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="python"><span class="s" style="color: #d14;">positive if<span class="idiff left right">f</span> the server is ahead of the client.</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="python"><span class="s" style="color: #d14;">positive if the server is ahead of the client.</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="python"><span class="s" style="color: #d14;">Theta is estimated by [(t_2-t_1)+(t_3-t_4)]/2. The accuracy of this</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="python"><span class="s" style="color: #d14;">estimate is predicated upon network latency being symmetrical.</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="python"><span class="s" style="color: #d14;">Delta is the network round trip time, i.e. (t_4-t_1)-(t_3-t_2). Here's</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="python"><span class="s" style="color: #d14;">how the terms work: (t_4-t_1) is the total time that the request was</span></span>
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="python"><span class="s" style="color: #d14;">in flight, and (t_3-t_2) is time that the server spent processing it;</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="python"><span class="s" style="color: #d14;">in flight, and (t_3-t_2) is t<span class="idiff left right">he t</span>ime that the server spent processing it;</span></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="python"><span class="s" style="color: #d14;">when you subtract that out you're left with just network delays.</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="python"><span class="s" style="color: #d14;">Lambda nominally represents the maximum amount by which theta could be</span></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">@@ -143,7 +143,7 @@ If you look at the raw data, there are 3 unknowns:</td>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="python"><span class="s" style="color: #d14;"> * clock offset</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="python"><span class="s" style="color: #d14;">but there are only two equations, so you can't solve it.</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="python"></span>
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="python"><span class="s" style="color: #d14;">NTP gets <span class="idiff left right">a</span> 3rd equation by assuming the transit times are equal. That lets</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="python"><span class="s" style="color: #d14;">NTP gets <span class="idiff left right">the</span> 3rd equation by assuming the transit times are equal. That lets</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="python"><span class="s" style="color: #d14;">it solve for the clock offset.</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="python"><span class="s" style="color: #d14;">If you assume that both clocks are accurate which is reasonable if you have</span></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">@@ -153,7 +153,7 @@ direction.</td>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="python"><span class="s" style="color: #d14;">The RFC 5905 diagram is slightly out of date in that the digest header assumes</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="python"><span class="s" style="color: #d14;">a 128-bit (16-octet) MD5 hash, but it is also possible for the field to be a</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="python"><span class="s" style="color: #d14;">128-bit AES_CMAC hash or 160-bit (20-octet) SHA-1 hash. NTPsec will</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="python"><span class="s" style="color: #d14;">support any 128- or 160-bit MAC type in li<span class="idiff left right">n</span>crypto.</span></span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="python"><span class="s" style="color: #d14;">support any 128- or 160-bit MAC type in li<span class="idiff left right">b</span>crypto.</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="python"><span class="s" style="color: #d14;">An extension field consists of a 16-bit network-order type field</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="python"><span class="s" style="color: #d14;">length, followed by a 16-bit network-order payload length in octets,</span></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">@@ -189,11 +189,11 @@ Here's what a Mode 6 packet looks like:</td>
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="python"><span class="s" style="color: #d14;"> | Key Identifier |</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="python"><span class="s" style="color: #d14;"> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="python"><span class="s" style="color: #d14;"> | |</span></span>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="python"><span class="s" style="color: #d14;"> | <span class="idiff left right"> dgst (128) </span> |</span></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="python"><span class="s" style="color: #d14;"> | <span class="idiff left right">digest (128)</span> |</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="python"><span class="s" style="color: #d14;"> | |</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="python"><span class="s" style="color: #d14;"> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="python"></span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="python"><span class="s" style="color: #d14;">In this case the fixed header is 24 bytes long.</span></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="python"><span class="s" style="color: #d14;">In this case<span class="idiff left right">,</span> the fixed header is 24 bytes long.</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="python"><span class="s" style="color: #d14;">R = Response bit</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="python"><span class="s" style="color: #d14;">E = Error bit</span></span>
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