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<p>Hi Davey,<br>
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<p>There used to be a message on the atlas.ripe.net frontpage, I retrieved it from google cache:<br>
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Due to an unfortunate bug in a recent probe firmware (version 4760), TCP based DNS measurements are not providing correct results. This affects all ongoing and one-off measurements.</p>
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The issue also affected DNSMON measurements between 14-23 March. On 23 March we deployed a corrected firmware on RIPE Atlas anchors (version 4770), and in the near future we'll deploy it on regular probes as well.</p>
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Our excuses for the inconvenience caused!<br>
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<p>So any probe that is still on version 4760 will provide timeouts for TCP DNS lookups.<br>
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<p>Cheers,<br>
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<p>Wouter<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> ripe-atlas <ripe-atlas-bounces@ripe.net> on behalf of Davey Song(宋林健) <ljsong@biigroup.cn><br>
<b>Sent:</b> Tuesday, May 9, 2017 10:03 AM<br>
<b>To:</b> ripe-atlas@ripe.net<br>
<b>Subject:</b> [atlas] Many timeout-failures for DNS over TCP</font>
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<p class="MsoNormal"><span lang="EN-US">Hi folks, </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I setup measurements for DNS queries over both TCP and UDP. I found the timeout and failures of TCP is far more than UDP.
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">For example :</span></p>
<p class="MsoNormal"><span lang="EN-US">DNS over TCP: <a href="https://atlas.ripe.net/measurements/8552847/#!probes">
https://atlas.ripe.net/measurements/8552847/#!probes</a></span></p>
<p class="MsoNormal"><span lang="EN-US">DNS over UDP: <a href="https://atlas.ripe.net/measurements/8552846/#!probes">
https://atlas.ripe.net/measurements/8552846/#!probes</a> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Is it normal ? I mean is there any special timeout routine/parameters of atlas probes from normal resolver?</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Davey</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
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