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 <abalas...@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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>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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