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<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D">Also you can try removing “dns” from your
</span><span style="color:#1F497D">nsswitch.conf file or hard coding the bad server name in the hosts file (remember to use ipv4 and ipv6 if needed).</span></a><span style="color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D">Robert <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Users [mailto:users-bounces@lists.opensips.org]
<b>On Behalf Of </b>Mundkowsky, Robert<br>
<b>Sent:</b> Thursday, May 11, 2017 6:39 PM<br>
<b>To:</b> OpenSIPS users mailling list <users@lists.opensips.org><br>
<b>Subject:</b> Re: [OpenSIPS-Users] How can I prevent Opensips to cache DNS queries.<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Is there a name server running on your box?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<pre><span style="font-family:"Calibri",sans-serif;color:#1F497D">man7.org/linux/man-pages/man5/resolv.conf.5.html says “</span>If this file does not exist, only the name server on the local machine will be queried<o:p></o:p></pre>
<p class="MsoNormal"><span style="color:#1F497D">”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D">Robert <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Users [<a href="mailto:users-bounces@lists.opensips.org">mailto:users-bounces@lists.opensips.org</a>]
<b>On Behalf Of </b>Stefan Carlsson<br>
<b>Sent:</b> Thursday, May 11, 2017 4:50 AM<br>
<b>To:</b> OpenSIPS users mailling list <<a href="mailto:users@lists.opensips.org">users@lists.opensips.org</a>><br>
<b>Subject:</b> Re: [OpenSIPS-Users] How can I prevent Opensips to cache DNS queries.<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D">Hi !<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D">Thanks for your reply.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D">I did the following.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I’ve checked my nsswitch.conf file and it says ’files dns’ as in default , so no change there.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">I “disabled the resolver” but simply commented out the dns servers in resolv.conf, checked the resolver by a simple ping to
<a href="http://www.google.com">www.google.com</a>, got the response: ‘unknown host’ as it should.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Then I’ve put our SIP operators ip-name pairs in the hosts file, EXCEPT the one that causes us problem , checked with ping , got hits on all of them, and the one that where the problem responded with
‘unknown host’,<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D">so the system looks up the hosts file correctly.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">But STILL Opensips uses the faulty one , the IP is not in the hosts file, no dns servers is in the resolv.conf.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">5)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Restarts the Opensips, now it works as expected.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Can anyone out there give me an explanation that causes this behavior ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Again, thank you for your attend at this matter.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Kind Regards / Vänligen …<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Stefan Carlsson<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span lang="SV" style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Users [<a href="mailto:users-bounces@lists.opensips.org">mailto:users-bounces@lists.opensips.org</a>]
<b>On Behalf Of </b>Mundkowsky, Robert<br>
<b>Sent:</b> den 10 maj 2017 15:13<br>
<b>To:</b> OpenSIPS users mailling list <<a href="mailto:users@lists.opensips.org">users@lists.opensips.org</a>><br>
<b>Subject:</b> Re: [OpenSIPS-Users] How can I prevent Opensips to cache DNS queries.<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">What do you mean you “</span>disabled the resolver<span style="color:#1F497D">”?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I haven’t play with this in a long time, but I think the /etc/nsswitch.conf file defines if you use /etc/hosts file or/and DNS for looking up host names, and might allow nis+ as well, but I can’t remember.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So might want to check if you happen to have your hostname defined in the hosts file. Also seems people note that /etc/resolv.conf might be overwrite at boot based on using NetworkManager. So maybe your settings
are being over written.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D">Robert<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Users [<a href="mailto:users-bounces@lists.opensips.org">mailto:users-bounces@lists.opensips.org</a>]
<b>On Behalf Of </b>Stefan Carlsson<br>
<b>Sent:</b> Tuesday, May 9, 2017 5:36 AM<br>
<b>To:</b> <a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><br>
<b>Subject:</b> [OpenSIPS-Users] How can I prevent Opensips to cache DNS queries.<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="SV">Hi !<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV"><o:p> </o:p></span></p>
<p class="MsoNormal">It seems that the Opensip 2.2 caches DNS queries !!!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Even after I disabled the resolver in Centos, the OpenSIPs seems to “remember” old queries. (eg. IP’s)<o:p></o:p></p>
<p class="MsoNormal">after a Opensip restart, the old stuff was gone.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If so, how can I disable the DNS caching in the Opensips, I want the system to always make a new , fresh<o:p></o:p></p>
<p class="MsoNormal">query.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Kind Regards / Vänligen …<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Stefan Carlsson<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
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