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<div class="WordSection1">
<p class="MsoNormal"><span style="color:windowtext">The scenario here is the other end’s RESET/connection closure will never reach Kamailio, as the client has lost it’s network connectivity.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">In such case expected Kamailio to reset the TCP connection after 120seconds based on the TCP keepalive config params mentioned earlier. From wireshark capture observe, Kamailio
</span> keeps resending TCP keepalive packets at varying intervals for varying duration length(like 6mins, 14mins..) before resetting the TCP connections.<span style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:windowtext">thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">raj<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:windowtext"><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><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Daniel-Constantin Mierla <miconda@gmail.com>
<br>
<b>Sent:</b> Wednesday, June 12, 2019 1:36 PM<br>
<b>To:</b> R, Rajkumar (Raj) <rajkumaradass@avaya.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> Re: [SR-Users] TCP reset behavior<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>If it is established, then the other side didn't actually requested the close of the connection. It should be in close-wait state when the remote peer sent the close request.<o:p></o:p></p>
<p>Look at the traffic of the connection with wireshare, it shows also the tcp control packets.<o:p></o:p></p>
<div>
<p class="MsoNormal">On 12.06.19 09:57, R, Rajkumar (Raj) wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="color:windowtext">It remained in ‘ESTABLISHED’ state only. Please find netstat output below.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"># netstat -natlp</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Active Internet connections (servers and established)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">tcp 0 0 0.0.0.0:5060 0.0.0.0:* LISTEN 20/kamailio</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN -</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">tcp 0 0 0.0.0.0:411 0.0.0.0:* LISTEN -</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN -</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">tcp 0 0 0.0.0.0:5056 0.0.0.0:* LISTEN 20/kamailio</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:red">tcp 0 3777 10.1.4.55:5060 10.27.117.55:38115 ESTABLISHED 20/Kamailio</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="color:windowtext">thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">raj</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">+918067153382</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Daniel-Constantin Mierla
<a href="mailto:miconda@gmail.com"><miconda@gmail.com></a> <br>
<b>Sent:</b> Wednesday, June 12, 2019 12:29 PM<br>
<b>To:</b> R, Rajkumar (Raj) <a href="mailto:rajkumaradass@avaya.com"><rajkumaradass@avaya.com></a>; Kamailio (SER) - Users Mailing List
<a href="mailto:sr-users@lists.kamailio.org"><sr-users@lists.kamailio.org></a><br>
<b>Subject:</b> Re: [SR-Users] TCP reset behavior</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p>Hello,<o:p></o:p></p>
<p>the connection state is OK in all outputs, so not seen as closed by Kamailio.<o:p></o:p></p>
<p>Can you get the output of the netstat for that connection after is supposed to be closed to see its state there?<o:p></o:p></p>
<p>Cheers,<br>
Daniel<o:p></o:p></p>
<div>
<p class="MsoNormal">On 11.06.19 12:17, Daniel-Constantin Mierla wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>Hello,<o:p></o:p></p>
<p>I didn't get the time to look at. It was a long weekend in Germany, with Monday being public holiday. Not sure if I get to it today, but hope to get time in the next few days.<o:p></o:p></p>
<p>Cheers,<br>
Daniel<o:p></o:p></p>
<div>
<p class="MsoNormal">On 11.06.19 07:56, R, Rajkumar (Raj) wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="color:windowtext">Did the shared tcp stats help? Awaiting your inputs on this.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="color:windowtext">thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">raj</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> sr-users
<a href="mailto:sr-users-bounces@lists.kamailio.org"><sr-users-bounces@lists.kamailio.org></a>
<b>On Behalf Of </b>R, Rajkumar (Raj)<br>
<b>Sent:</b> Friday, June 7, 2019 10:44 PM<br>
<b>To:</b> <a href="mailto:miconda@gmail.com">miconda@gmail.com</a>; Kamailio (SER) - Users Mailing List
<a href="mailto:sr-users@lists.kamailio.org"><sr-users@lists.kamailio.org></a><br>
<b>Subject:</b> Re: [SR-Users] TCP reset behavior</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Hi Daniel,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Please find attached stats output captured every 2 seconds for the entire duration of test (i.e., Start of registration from client till the connection towards client is reset by kamailio after 17mins approximately).
I had used ‘kamcmd’ instead of ‘kamctl’ for same command arguments.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Setup:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">10.27.117.55 (Client) --- Kamailio (10.1.4.55) ---- Backend server (10.2.8.70)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Summary of events executed/observed during the test:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="color:windowtext;margin-left:0in;mso-list:l0 level1 lfo3">
Once the client is registered successfully to the backend, turned off WiFi connection at the client side (time 13:07.05 UTC 2019).
<o:p></o:p></li><li class="MsoListParagraph" style="color:windowtext;margin-left:0in;mso-list:l0 level1 lfo3">
After OPTIONS msg time out for response from the client, backend closes the TCP connection towards kamailio ( around time 13:10:39),<o:p></o:p></li><li class="MsoListParagraph" style="color:windowtext;margin-left:0in;mso-list:l0 level1 lfo3">
TCP connection towards client side is reset at 13:24:30 (i.e., 17 minutes since the WiFi is turned off)<o:p></o:p></li><li class="MsoListParagraph" style="color:windowtext;margin-left:0in;mso-list:l0 level1 lfo3">
In wireshark, see re-transmission of a TCP packet from kamailio for about 15 minutes until connection release.<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="color:windowtext">thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:windowtext">raj</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="color:windowtext"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>>
<br>
<b>Sent:</b> Friday, June 7, 2019 6:14 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>>; R, Rajkumar (Raj) <<a href="mailto:rajkumaradass@avaya.com">rajkumaradass@avaya.com</a>><br>
<b>Subject:</b> Re: [SR-Users] TCP reset behavior</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p>Hello,<o:p></o:p></p>
<p>can you reproduce the case and then get the output of the next commands:<o:p></o:p></p>
<p>kamctl rpc core.tcp_list<o:p></o:p></p>
<p>kamctl rpc core.tcp_options<o:p></o:p></p>
<p>kamctl rpc core.tcp_info<o:p></o:p></p>
<p>Cheers,<br>
Daniel<o:p></o:p></p>
<div>
<p class="MsoNormal">On 06.06.19 18:53, R, Rajkumar (Raj) wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">In our setup running kamailio (alpine image) in stateless mode and have following TCP config set. After client registers to the backend see two TCP connections created – one towards the client and the other towards the backendserver. If
there’s a abrupt network disconnect either at the client side or at the backend side, do not see TCP reset happening from kamailio as per the config. Per below config expected after 120seconds( = [tcp_keepidle] + ( [tcp_keepintvl * tcp_keepcnt] ) instead it
keeps resending TCP keepalive packets at varying intervals for varying duration length(like 6mins, 14mins..) before resetting the TCP connections. Also want to mention that we are not using TCPOPS module here.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am trying to achieve consistent duration for TCP reset in kamailio. Could you please point me if I have missed anything here?
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><i>Setup:</i></b><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Client ---- Kamailio (stateless mode) ---- Backend server <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b>TCP Config:</b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000">tcp_connection_lifetime = 3600</span></b><o:p></o:p></p>
<p class="MsoNormal">tcp_accept_aliases = no<o:p></o:p></p>
<p class="MsoNormal">tcp_async = yes<o:p></o:p></p>
<p class="MsoNormal">tcp_connect_timeout = 10<o:p></o:p></p>
<p class="MsoNormal">tcp_crlf_ping = yes<o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000">tcp_keepalive = yes</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000">tcp_keepcnt = 3</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000">tcp_keepidle = 30</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="color:#C00000">tcp_keepintvl = 30 # Total 2 mins - 30+(30*3)=120 sec</span></b><o:p></o:p></p>
<p class="MsoNormal">tcp_linger2 = 30<o:p></o:p></p>
<p class="MsoNormal">tcp_rd_buf_size = 65536<o:p></o:p></p>
<p class="MsoNormal">tcp_send_timeout = 10<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">thanks,<o:p></o:p></p>
<p class="MsoNormal">raj<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"> <o:p></o:p></p>
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