Re: siptrace module not respecting send_sock after kamailio 5.6.6

Hello,


do you have IP routing path from the external_ip to the homer server?
Like, it is possible to open connection to the homer server from both
internal_ip and external_ip? If yes, even when the application tries to
indicate the desired local ip:port when creating a tcp connection, it is
the tcp stack/kernel that makes the final decision.


If you switch to udp for homer traffic, is the expected network
interface used?


Cheers,
Daniel


On 27.05.25 16:11, Daniel Donoghue via sr-users wrote:
> Hello,
>
> I have been using the siptrace module on a multihomed kamailio setup
> for some time now, with kamailio 5.5.7 and 5.6.6, without incident.
>
> I am listening to my external interface using something like:
>
> listen=tls:external_ip:5061
> listen=tcp:external_ip:5060
> Listen=tcp:internal_ip:5000 name "homer"
>
> And for siptrace...
>
> modparam("siptrace", "duplicate_uri", "sip:homer_ip:9060;transport=tcp")
> modparam("siptrace", "send_sock_name", "homer")
>
> I have also used send_sock_addr and force_send...
>
> This works as expected.
>
> I recently deployed this same setup using kamailio 6.0.1 and
> discovered that the send_sock is not being respected, even though the
> logs say it has been selected. Instead, tcpdump and careful
> examination of all the file descriptors for the kamailio processes
> reveal it is sending with the source set to my external_ip instead of
> the internal_ip.
>
> I have verified this on the same server, ruling out os level issues
> routing issues and have tried manually connecting using nc with the
> internal ip address for the source, which works.
>
> I tried downgrading, and found that the same is true for kamailio
> 5.7.6, 5.8.6 and 6.0.1
>
> This issue only appears to affect siptrace as other sockets appear to
> use the correct source ip to, for example, connect to a database.
>
> I had a look at the change logs and documentation and cant see
> anything obvious that I need to change from a configuration perspective.
>
> Could anybody help? I would prefer to be running 6.0+ in my new
> production environment but wont be able to if this cannot be solved
> quickly.
>
> Many thanks for your help.
>
> With every blessing,
> --
> Daniel Donoghue
>
>
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