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<p class="MsoNormal"><span lang="EN-US">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Question:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">Does the TM destination blacklist work, if destination host responds with ICMP “Destination Unreachable”?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Discussion:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">I have got an IMS scenario, where I think the destination blacklist is not working and try to find the reason.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">I use UDP between two Kamailio SIP Proxies (P-CSCF and S-CSCF) and send a SIP request to the primary instance of the S-CSCF.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">However the destination Kamailio has been stopped with kamctl stop before and so the destination machine responds with ICMP “Destination Unreachable”. DNS Failover towards secondary S-CSCF instance
works perfectly.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">Destination Blacklist does not work. I.e. the next SIP Request is sent to the primary host again, before failover to secondary host applies. I would have expected the request would be sent to
secondary host immediately.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">From the description in doc/dst_blacklist.txt<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"><span lang="EN-US">[…] A destination is added to the blacklist when an attempt to send to it fails (e.g.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"><span lang="EN-US">timeout while trying to send or connect on TCP), or when a SIP timeout occurs<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"><span lang="EN-US">while trying to forward statefully an INVITE (using tm)
<b><span style="color:red">and the remote side<o:p></o:p></span></b></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"><b><span lang="EN-US" style="color:red">doesn't send back any response</span></b><span lang="EN-US">.[…]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">I think the destination blacklist does not work, because an ICMP Response “Destination Unreachable” is received.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Second question:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">How could I avoid the problem?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks, Christoph<o:p></o:p></span></p>
</div>
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