[OpenSER-Users] stun

[Aymeric Moizard]

Stun can work even behind symmetric NAT if the stun server was
running on the same socket the SIP server is running... I hope
this feature will come soon!

I can help with this.

Also, SIP don't need to use STUN to work: you can discover your
IP address and port very easily by looking at the REGISTER answer
or OPTIONS answer which contains the "received" and "rport"
parameter.

Of course, symmetric NAT are a nightmare for RTP, but not for SIP...

tks,
Aymeric MOIZARD / ANTISIP
amsip - http://www.antisip.com
osip2 - http://www.osip.org
eXosip2 - http://savannah.nongnu.org/projects/exosip/


On Tue, 10 Jun 2008, Iñaki Baz Castillo wrote:

> El Tuesday 10 June 2008 10:44:51 Ali Jawad escribió:
>> Hi All
>>
>> I had a lot of problems with STUN and symmetric NAT. The thing is that
>> it does not always work with symmetric NAT. That would be mostly routers
>> based on Linux IPTABLES.
>
> STUN **CANNOT** work with symetric NAT. The NAT router maps the internal port
> with a different public port *depending* on the destination IP:port, so STUN
> can't work.
>
> -- 
> Iñaki Baz Castillo
> ibc at in.ilimit.es
>
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