<div dir="ltr">Can you print the logs when it tries to send the ACK?<div>Check also that the ACK ruri contains the same destination port which was used for the INVITE, otherwise a new connection will be created.</div><div><br></div><div>Best regards,</div><div><br></div><div>Federico</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 18, 2018 at 2:31 PM, Wilkins, Steve <span dir="ltr"><<a href="mailto:swwilkins@mitre.org" target="_blank">swwilkins@mitre.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div class="m_-8244761320131250806WordSection1">
<p class="MsoNormal">Thank you Alex and Federico,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I verified, and SO_REUSEPORT is defined on my OS. I am using Kamailio 5.2 and I set ‘tcp_reuse_port=yes;’ and $fs; this has been to no avail as ‘ACK’s’ are still using the high port number randomly assigned by Kamailio.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you all for sharing your knowledge!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><a name="m_-8244761320131250806__MailEndCompose"><u></u> <u></u></a></p>
<span></span>
<p class="MsoNormal"><b>From:</b> sr-users [mailto:<a href="mailto:sr-users-bounces@lists.kamailio.org" target="_blank">sr-users-bounces@<wbr>lists.kamailio.org</a>]
<b>On Behalf Of </b>Federico Cabiddu<br>
<b>Sent:</b> Friday, May 18, 2018 12:57 AM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org" target="_blank">sr-users@lists.kamailio.org</a>><br>
<b>Subject:</b> Re: [SR-Users] Transport issue thought<u></u><u></u></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">You are right Alex, Linux kernel didn't support SO_REUSEPORT, which allows a socket to be used as source for a tcp connection while is already bound, until version 3.9.<u></u><u></u></p>
<div>
<p class="MsoNormal">Kamailio's parameter tcp_reuse_port, if enabled and your OS has support for SO_REUSEPORT (so not only Linux but FreeBSD, OSX and others), allows you to use force_send_socket (or $fs) to send messages from a TCP port kamailio is listening
to.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Federico<u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">On Fri, May 18, 2018 at 12:28 AM, Alex Balashov <<a href="mailto:abalashov@evaristesys.com" target="_blank">abalashov@evaristesys.com</a>> wrote:<u></u><u></u></p>
<blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<p class="MsoNormal">When an outgoing TCP connection is opened, either a port can be<br>
explicitly bound, or it is auto-assigned by the OS's networking stack. I<br>
believe Kamailio does the latter and does not offer options to constrain<br>
the range. If it does, I'm not aware of any apart from this one:<br>
<br>
<a href="https://www.kamailio.org/wiki/cookbooks/5.1.x/core#tcp_reuse_port" target="_blank">https://www.kamailio.org/wiki/<wbr>cookbooks/5.1.x/core#tcp_<wbr>reuse_port</a><br>
<br>
Not sure if it would help in this case, you'd have to give it a try.<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On Thu, May 17, 2018 at 10:21:34PM +0000, Wilkins, Steve wrote:<br>
<br>
> It appears that the bottom line of my TCP transport not working is that Kamailio is randomly assigning large port numbers to send the TCP traffic out on.<br>
> I am not able to randomly open high ports for this purpose. Is there a way to tell Kamailio to only use specific ports for this. I have tried using<br>
> force_send_socket() with Kamailio' s IP, and the port I want to send out on, but this did not work either. Does this sound like I am on the right track?<br>
> <br>
> Thank you,<br>
> -<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal">> ______________________________<wbr>_________________<br>
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<span style="color:#888888"><br>
<br>
<span class="m_-8244761320131250806hoenzb">-- </span><br>
<span class="m_-8244761320131250806hoenzb">Alex Balashov | Principal | Evariste Systems LLC</span><br>
<br>
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<br>
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</blockquote>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div></div></div>
</div>
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<br></blockquote></div><br></div>