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<tt>Hi Ben,<br>
<br>
IMO, the log itself is broken as the data to be cached is not
printable ....so the logs you see may be misleading.<br>
<br>
When you say "OpenSIPS appeared to not be able to resolve the
domain", you mean OpenSIPS is not doing any attempt to solve the
FQDN, or you mean OpenSIPS is loading from cash something wrong ?<br>
<br>
Regards,<br>
</tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
OpenSIPS Summit 2019
<a class="moz-txt-link-freetext" href="https://www.opensips.org/events/Summit-2019Amsterdam/">https://www.opensips.org/events/Summit-2019Amsterdam/</a>
</pre>
<div class="moz-cite-prefix">On 12/06/2018 10:17 PM, Ben Newlin
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:B33A28B2-0DBE-4B56-91E9-E4DBA1FC5BBF@genesys.com">
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We use the
DNS cache module to reduce the time spent querying DNS
records. We recently had a customer call failing and we
traced the failure to the customer using an FQDN in the
Record-Route header. On the ACK, OpenSIPS appeared to not be
able to resolve the domain even though it had been
successfully resolved on the initial request. I found the
log for the DNS Cache module and noticed that the value it
was inserting was empty:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"
style="line-height:11.25pt;background:white"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">INFO:<span
style="background:#FAE9A4">dns_cache</span>:put_dnscache_value:
putting key [dnscache_customer.domain.com_a] with value []
ttl = 60<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">This
prompted me to examine all of our logs and I found that the
value for these DNS Cache logs is always empty, regardless
of the domain. It appears the records are not being
serialized properly into the cache. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The DNS
resolution must be succeeding or all of our requests using
DNS would be failing, but I have also verified the domains
all can be resolved manually on the same box:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">$ nslookup customer.domain.com<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Server: 10.27.0.2<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Address: 10.27.0.2#53<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Non-authoritative answer:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Name: customer.domain.com<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Address: 10.27.172.132<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Name: customer.domain.com<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Address: 10.27.192.211<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Name: customer.domain.com<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.5pt;font-family:"Courier
New";color:#333333">Address: 10.27.255.53<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Any
thoughts? Is there more information I can obtain to
determine the cause?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben
Newlin </span>
<o:p></o:p></p>
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