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Hello,<br>
<br>
I don't think there is a way to disable dns for outgoing uri
resolving, if you want disabling all dns.<br>
<br>
The dns timeout is can be configured at the operating system level.<br>
<br>
To avoid the sip worker blocking, you can try:<br>
<br>
a) look at $nh(d) and if it is not an IP, then you can use
async_route() (async_task_route() would be better, but now only in
devel) or mqueue+rtimer to pass the relaying of the request to
another worker process<br>
<br>
b) and an intermediary proxy, so you send the requests with FQDN to
it and it will return back to the proxy. You can send the dst-uri
via some custom headers. This would be like:<br>
<br>
[ua1] <===> [kamailio main] <===> [kamailio dns]
<===> [kamailio main] <===> [ua2]<br>
<br>
kamailio dns should not do record routing, because requests within
dialog should have IP addresses.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 29/07/14 14:31, Igor Potjevlesch
wrote:<br>
</div>
<blockquote cite="mid:00c401cfab29$06584250$1308c6f0$@gmail.com"
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<p class="MsoNormal"><span lang="EN-GB">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I’m using Kamailio 4.1
and I’m wondering how to avoid external DNS resolution.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I have the following
config:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">dns_cache_init=no<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">use_dns_cache=no<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">dns=no<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">rev_dns=no<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Even with this config, I
have many and many DNS query on SRV _sip for the hostnames
set in carrierroute module.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">These requests are not
useful because the A resolution is done by /etc/hosts.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Major problem with this,
is that when I have a DNS issue or IP transit issue,
Kamailio waits for resolution timeout and becomes
overloaded. As a consequence, Kamailio can’t treat others
SIP requests like REGISTER because he stuck in DNS
resolution.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Igor.<o:p></o:p></span></p>
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a></pre>
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