<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">2017-11-23 9:56 GMT+01:00 Michael Meier <span dir="ltr"><<a href="mailto:michael.meier@fau.de" target="_blank">michael.meier@fau.de</a>></span>:</div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Those times are reproducible, a machine will always get the same 15 or<br>
10 or 4 ms ping. So their anycasted 9.9.9.9 seems to internally redirect<br>
queries based on source-IP-hash, and if you're unlucky, they redirect<br>
you to a server at the other end of the continent, that has a latency<br>
that is worse than if you used a DNS in another european country.</blockquote><div><br></div><div>Hi All,</div><div><br></div><div>I think Quad9 uses round robin dns with server pools (3?) behind 9.9.9.9 anycast address: </div><div><br></div><div>My findigs: </div><div><br></div><div>$ for i in $(seq 0 9); do echo -n "$i "; dig +short @<a href="http://9.9.9.9" target="_blank">9.9.9.9</a> hostname.bind txt CH; sleep 3; done</div><div><br></div><div> 0 "<a href="http://res300.ams.rrdns.pch.net" target="_blank">res300.ams.rrdns.pch.net</a>"</div><div> 1 "<a href="http://res300.ams.rrdns.pch.net" target="_blank">res300.ams.rrdns.pch.net</a>"</div><div> 2 "<a href="http://res100.ams.rrdns.pch.net" target="_blank">res100.ams.rrdns.pch.net</a>"</div><div> 3 "<a href="http://res200.ams.rrdns.pch.net" target="_blank">res200.ams.rrdns.pch.net</a>"</div><div> 4 "<a href="http://res200.ams.rrdns.pch.net" target="_blank">res200.ams.rrdns.pch.net</a>"</div><div> 5 "<a href="http://res200.ams.rrdns.pch.net" target="_blank">res200.ams.rrdns.pch.net</a>"</div><div> 6 "<a href="http://res300.ams.rrdns.pch.net" target="_blank">res300.ams.rrdns.pch.net</a>"</div><div> 7 "<a href="http://res200.ams.rrdns.pch.net" target="_blank">res200.ams.rrdns.pch.net</a>"</div><div> 8 "<a href="http://res300.ams.rrdns.pch.net" target="_blank">res300.ams.rrdns.pch.net</a>"</div><div> 9 "<a href="http://res300.ams.rrdns.pch.net" target="_blank">res300.ams.rrdns.pch.net</a>" <br></div><div><br></div><div>... Quand9 dns server are not created equal:</div></div><br>$ for i in $(seq 0 9); do echo -n "$i "; dig +short @<a href="http://9.9.9.9">9.9.9.9</a> version.bind txt CH; sleep 3; done</div><div class="gmail_extra"><div class="gmail_extra"><br></div><div class="gmail_extra"> 0 "Q9-U-5.0"</div><div class="gmail_extra"> 1 "Q9-P-5.0"</div><div class="gmail_extra"> 2 "Q9-U-5.0"</div><div class="gmail_extra"> 3 "Q9-P-5.0"</div><div class="gmail_extra"> 4 "Q9-P-5.0"</div><div class="gmail_extra"> 5 "Q9-U-5.0"</div><div class="gmail_extra"> 6 "Q9-P-5.0"</div><div class="gmail_extra"> 7 "Q9-P-5.0"</div><div class="gmail_extra"> 8 "Q9-P-5.0"</div><div class="gmail_extra"> 9 "Q9-P-5.0"</div><div class="gmail_extra"><br></div><div>E.</div>-- <br><div class="gmail-m_-2326443659450183619gmail_signature">| ENRICO ARDIZZONI<br>| Responsabile Ufficio Reti e Sistemi<br>| Università degli Studi di Ferrara</div>
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