[SR-Users] Transport issue thought

[Wilkins, Steve]

The INVITE has no port assigned in ruri, so I assume it is using the default port of 5060; the ACK does have 5060 in the ruri.  Even if a new connection is created shouldn’t it be using the listen tcp port since I have tcp_reuse_port=yes?

Thank you!

From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of Federico Cabiddu
Sent: Friday, May 18, 2018 8:49 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Transport issue thought

Can you print the logs when it tries to send the ACK?
Check also that the ACK ruri contains the same destination port which was used for the INVITE, otherwise a new connection will be created.

Best regards,

Federico

On Fri, May 18, 2018 at 2:31 PM, Wilkins, Steve <swwilkins at mitre.org<mailto:swwilkins at mitre.org>> wrote:
Thank you Alex and Federico,

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.

Thank you all for sharing your knowledge!


From: sr-users [mailto:sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>] On Behalf Of Federico Cabiddu
Sent: Friday, May 18, 2018 12:57 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Subject: Re: [SR-Users] Transport issue thought

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.
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.

Cheers,

Federico

On Fri, May 18, 2018 at 12:28 AM, Alex Balashov <abalashov at evaristesys.com<mailto:abalashov at evaristesys.com>> wrote:
When an outgoing TCP connection is opened, either a port can be
explicitly bound, or it is auto-assigned by the OS's networking stack. I
believe Kamailio does the latter and does not offer options to constrain
the range. If it does, I'm not aware of any apart from this one:

https://www.kamailio.org/wiki/cookbooks/5.1.x/core#tcp_reuse_port

Not sure if it would help in this case, you'd have to give it a try.

On Thu, May 17, 2018 at 10:21:34PM +0000, Wilkins, Steve wrote:

> 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.
> 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
> 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?
>
> Thank you,
> -
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