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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/6924806252508b110d2c253a9842300b617dc09a">69248062</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2019-02-18T01:46:04Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mre work towars NTPv5. Add passing leap offset to objectives.
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<h4>1 changed file:</h4>
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<a href="#9e6facf84d8e6ca6376177b93a71218f3632d443">
devel/ntpv5.adoc
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<h4>Changes:</h4>
<li id="9e6facf84d8e6ca6376177b93a71218f3632d443">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/6924806252508b110d2c253a9842300b617dc09a#9e6facf84d8e6ca6376177b93a71218f3632d443"><strong>devel/ntpv5.adoc</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">= Preliminary design notes for the NTPv5 protocol</span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">NTPv4 is showing its age. There are functional capabilities that</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">would be very useful if they could be standardized but</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">currently are not.</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">== Why NTPv5? ==</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">This document will first list these missing bits, then discuss</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">ways to incorporate them.</span>
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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">timestamps 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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<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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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">avoiding source loops does not play well with IPv6, and collisions</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">have vbeen observed in the wild.</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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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="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">== The missing data: a semantic view</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">This document will first list these missing bits, then discuss</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">ways to incorporate them.</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">=== REFIDs</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">Reference IDs are used by Stratum 1 sources to identify clocks and</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">@@ -16,17 +29,18 @@ clock types, and by hosts at higher strata to perform loop detection.</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">The REFID field is four octets long, sufficient to hold an IPv4 address</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">for loop detection; this is inadequate for IPv6, so the reference ID of</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext">an IPv6 host is a 4-octet hash of its actual address. <span class="idiff left right">Hash collisions</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"><span class="idiff left right">have been observed in the wild, possibly resulting in false-positive</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">loop detection.</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">an IPv6 host is a 4-octet hash of its actual address. <span class="idiff left right">AS previously</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"><span class="idiff left right">noted, hash collisions have been observed in the wild - possibly</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"><span class="idiff left right">resulting in false-positive </span>loop detection.</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">The new protocol should support REFIDs at least as long as an IPv6</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">address (16 octets).</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">=== Timescale</span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext">Most servers ship UTC. Some ship TAI. Some perform leap-second</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">smearing, some do not.</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">Most servers ship UTC in seconds since the current era start. Some</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">ship TAI since current era start. Some perform leap-second smearing,</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext">some do not.</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">The new protocol should enable a server to advertise its timescale,</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">including, if applicable in its timescale, its current leap second offset.</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">@@ -35,12 +49,19 @@ including, if applicable in its timescale, its current leap second offset.</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">NTP dates are 64-bit counters based on an epoch.</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="plaintext">The new protocol should enable a server to ship a year identifying its</span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">epoch.</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">The new protocol should either enable a server to ship a year identifying the</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">epoch on which its counters are based or ship a non-counter timestamp</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">format such as MJD plus seconds and fractional seconds since midnight.</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">=== Leap offset</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">Regardless of what timescale is shipped, the protocol should allow</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">leap second notications, warnings, and the current offset to be passed</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext">from IERS and/or national time authorities to users.</span>
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40
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">=== NTS</span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext">The new protocol needs to support NTS extension fields.</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">The new protocol needs to <span class="idiff left right">(continue to) </span>support NTS extension fields.</span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">== Extensions vs. replacement</span>
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