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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/38662175a00b3c7d40415cdbcf7439c4696c76b3">38662175</a></strong>
<div>
<span>by Eric S. Raymond</span>
<i>at 2017-09-19T13:55:20Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mitigation strategy for clock rollovers.
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<h4>1 changed file:</h4>
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<a href="#a4b3179f71939609cb86e36fbc402f8f57ac249c">
docs/rollover.txt
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<h4>Changes:</h4>
<li id="a4b3179f71939609cb86e36fbc402f8f57ac249c">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/38662175a00b3c7d40415cdbcf7439c4696c76b3#a4b3179f71939609cb86e36fbc402f8f57ac249c"><strong>docs/rollover.txt</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">@@ -228,7 +228,8 @@ This technique will postpones time-warping to a full 1024 weeks after</td>
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="plaintext">the pivot date - which the vendor typically makes the release date</span>
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext">of the device firmware. But it won't do any better than that; without the</span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext">ability to change the base date, the device will ship incorrect</span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="plaintext">reports forever afterwards.</span>
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<pre style="margin: 0;">+<span id="LC231" class="line" lang="plaintext">reports forever afterwards. A few refclocks, like the HP-GPS line,</span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext">have that ability; most do not.</span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext">This where careless, low-budget design begins to matter. GPS vendors</span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext">do not document even the fact that they use base or pivot dates, let</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="256" 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="257" 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">@@ -256,6 +257,16 @@ need to be aware of the possibility that their device could roll over</td>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="plaintext">at any time (but especially near the zero dats of a GPS era) and be</span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="plaintext">ready to compensate by dropping in a device with a newer pivot date.</span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="plaintext">Actionable advice that follows from this: If you don't know the</span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext">manufacturing date of a GPS-based device to within a couple of years,</span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext">don't trust that it won't be rolled over and useless *the first time</span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="plaintext">you start it*. Shopping for cheap refclocks at surplus houses or</span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="plaintext">on the Web is particularly hazardous this way.</span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext">A fairly bulletproof mitigation strategy, if you are running</span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext">autonomously, is to have multiple GPS clocks per server and replace</span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="plaintext">each individual one at least once every nine years (half a GPS era).</span>
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="plaintext">[[ntp_pivots]]</span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="plaintext">== NTP pivot dates ==</span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="plaintext"></span>
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