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<p>Kamailio just sets the keepalive options to the socket, sending
and handling of the response (or lack of) is done at OS/kernel
layer. Kamailio is notified if the connection changes the state.</p>
<p>Check the sysctl values for tcp keepalive and try to change them
there to see if if makes any difference.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 12.06.19 13:20, R, Rajkumar (Raj)
wrote:<br>
</div>
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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
<a class="moz-txt-link-rfc2396E" href="mailto:miconda@gmail.com"><miconda@gmail.com></a>
<br>
<b>Sent:</b> Wednesday, June 12, 2019 1:36 PM<br>
<b>To:</b> R, Rajkumar (Raj)
<a class="moz-txt-link-rfc2396E" href="mailto:rajkumaradass@avaya.com"><rajkumaradass@avaya.com></a>; Kamailio (SER) - Users
Mailing List <a class="moz-txt-link-rfc2396E" href="mailto:sr-users@lists.kamailio.org"><sr-users@lists.kamailio.org></a><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"
moz-do-not-send="true"><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"
moz-do-not-send="true"><rajkumaradass@avaya.com></a>;
Kamailio (SER) - Users Mailing List
<a href="mailto:sr-users@lists.kamailio.org"
moz-do-not-send="true"><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"
moz-do-not-send="true"><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"
moz-do-not-send="true">miconda@gmail.com</a>;
Kamailio (SER) - Users Mailing List
<a href="mailto:sr-users@lists.kamailio.org"
moz-do-not-send="true"><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"
moz-do-not-send="true">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"
moz-do-not-send="true">sr-users@lists.kamailio.org</a>>;
R, Rajkumar (Raj) <<a
href="mailto:rajkumaradass@avaya.com"
moz-do-not-send="true">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>
<pre>_______________________________________________<o:p></o:p></pre>
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a></pre>
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