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<tt>Hi!<br>
<br>
Thank you for the pointers Stephane and Baptiste! Already running
new measures!<br>
<br>
Best regards,<br>
</tt>
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piso | 1050-132 Lisboa | Portugal</div>
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<div class="moz-cite-prefix">Baptiste Jonglez wrote on 22-11-2017
23:14:<br>
</div>
<blockquote type="cite" cite="mid:20171122231436.GB11585@imag.fr">
<pre wrap="">Hi,
On 22-11-17, Eduardo Duarte wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi all,
After the recent launch of the Quad9 service I try to discover if it had
a best response time them my actual resolver, that is google public DNS.
To do this I launch a comparing measurement using atlas that would run
during one day to the same address from the probes in my ISP.
The address that I was trying has a very high TTL so I was expecting to
always hit the cache of the servers and them get a good comparison base.
I know that there are other factors involve in server response time but
to my home connection I fill that this where enough.
</pre>
</blockquote>
<pre wrap="">
Instead of asking for a regular name, you can query a special name like
"version.bind" in the CHAOS class. These queries are always answered
directly, so it simulates a 100% cache hit and allows you to measure the
RTT towards a resolver.
To test with dig:
$ dig @9.9.9.9 CH version.bind TXT
See <a class="moz-txt-link-freetext" href="https://atlas.ripe.net/measurements/9740262/">https://atlas.ripe.net/measurements/9740262/</a> for a real measurement
using this technique.
Baptiste
</pre>
<blockquote type="cite">
<pre wrap="">
When I got the results from the measurement they were not what I
expected.... The measurements to Quad9 had high value of REFUSAL.
Does any one as a clue why???
The measurement result is available at
<a class="moz-txt-link-freetext" href="https://atlas.ripe.net/measurements/10269508">https://atlas.ripe.net/measurements/10269508</a>
Best regards,
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
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