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Hello,<br>
<br>
<br>
<div class="moz-cite-prefix">On 04/08/14 14:20, Igor Potjevlesch
wrote:<br>
</div>
<blockquote cite="mid:001901cfafde$8dc08a40$a9419ec0$@gmail.com"
type="cite">
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<div class="WordSection1">
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D">Hello
Daniel,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB">Thank you. If I use the resolver included in <span
class="SpellE">Kamailio</span> and if the response from
the resolver is negative, is there a new DNS request sent
for outgoing <span class="SpellE">uri</span> resolution?</span></p>
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</blockquote>
<br>
it should not be any other dns request -- it will fail sending.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<blockquote cite="mid:001901cfafde$8dc08a40$a9419ec0$@gmail.com"
type="cite">
<div class="WordSection1">
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB">If not, that would mitigate the volume of DNS
requests sent.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB">Igor.<o:p></o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span
style="mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times
New
Roman";mso-bidi-theme-font:minor-bidi;color:#1F497D;mso-ansi-language:EN-GB"
lang="EN-GB"><o:p> </o:p></span></a></p>
<span style="mso-bookmark:_MailEndCompose"></span>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailOriginal"><b><span
style="mso-fareast-font-family:"Times New
Roman";color:windowtext;mso-fareast-language:FR">De :</span></b></a><span
style="mso-bookmark:_MailOriginal"><span
style="mso-fareast-font-family:"Times New
Roman";color:windowtext;mso-fareast-language:FR">
<a class="moz-txt-link-abbreviated" href="mailto:sr-users-bounces@lists.sip-router.org">sr-users-bounces@lists.sip-router.org</a>
[<a class="moz-txt-link-freetext" href="mailto:sr-users-bounces@lists.sip-router.org">mailto:sr-users-bounces@lists.sip-router.org</a>] <b>De
la part de</b> Daniel-Constantin Mierla<br>
<b>Envoyé :</b> vendredi 1 août 2014 08:46<br>
<b>À :</b> Kamailio (SER) - Users Mailing List<br>
<b>Objet :</b> Re: [SR-Users] Understanding DNS
resolution done by Kamailio<o:p></o:p></span></span></p>
</div>
</div>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="mso-bookmark:_MailOriginal"><span
style="mso-fareast-font-family:"Times New
Roman"">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</span></span><span
style="mso-bookmark:_MailOriginal"><span
style="font-size:12.0pt;mso-fareast-font-family:"Times
New Roman";mso-fareast-language:FR"><o:p></o:p></span></span></p>
<div>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-fareast-font-family:"Times New
Roman"">On 29/07/14 14:31, Igor Potjevlesch wrote:<o:p></o:p></span></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Hello,</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">I’m using
Kamailio 4.1 and I’m wondering how to avoid external DNS
resolution.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">I have the
following config:</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">dns_cache_init=no</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">use_dns_cache=no</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">dns=no</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">rev_dns=no</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Even with
this config, I have many and many DNS query on SRV _sip
for the hostnames set in carrierroute module.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">These
requests are not useful because the A resolution is done
by /etc/hosts.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" 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.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Regards,</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB"> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Igor.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-font-family:"Times
New Roman";mso-fareast-language:FR"><br>
<br style="mso-special-character:line-break">
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style="mso-special-character:line-break">
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<pre><span style="mso-bookmark:_MailOriginal">_______________________________________________<o:p></o:p></span></pre>
<pre><span style="mso-bookmark:_MailOriginal">SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list<o:p></o:p></span></pre>
<pre><span style="mso-bookmark:_MailOriginal"></span><a moz-do-not-send="true" href="mailto:sr-users@lists.sip-router.org"><span style="mso-bookmark:_MailOriginal">sr-users@lists.sip-router.org</span><span style="mso-bookmark:_MailOriginal"></span></a><span style="mso-bookmark:_MailOriginal"><o:p></o:p></span></pre>
<pre><span style="mso-bookmark:_MailOriginal"></span><a moz-do-not-send="true" href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users"><span style="mso-bookmark:_MailOriginal">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</span><span style="mso-bookmark:_MailOriginal"></span></a><span style="mso-bookmark:_MailOriginal"><o:p></o:p></span></pre>
</blockquote>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-font-family:"Times
New Roman";mso-fareast-language:FR"><br
style="mso-special-character:line-break">
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style="mso-special-character:line-break">
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<pre><span style="mso-bookmark:_MailOriginal">-- <o:p></o:p></span></pre>
<pre><span style="mso-bookmark:_MailOriginal">Daniel-Constantin Mierla - </span><a moz-do-not-send="true" href="http://www.asipto.com"><span style="mso-bookmark:_MailOriginal">http://www.asipto.com</span><span style="mso-bookmark:_MailOriginal"></span></a><span style="mso-bookmark:_MailOriginal"><o:p></o:p></span></pre>
<pre><span style="mso-bookmark:_MailOriginal"></span><a moz-do-not-send="true" href="http://twitter.com/#%21/miconda"><span style="mso-bookmark:_MailOriginal">http://twitter.com/#!/miconda</span><span style="mso-bookmark:_MailOriginal"></span></a><span style="mso-bookmark:_MailOriginal"> - </span><a moz-do-not-send="true" href="http://www.linkedin.com/in/miconda"><span style="mso-bookmark:_MailOriginal">http://www.linkedin.com/in/miconda</span><span style="mso-bookmark:_MailOriginal"></span></a><span style="mso-bookmark:_MailOriginal"></span><o:p></o:p></pre>
</div>
</blockquote>
<br>
<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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