netdev - Re: SIP proxying: siproxd vs. Netfilter SIP nat

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Date:	Mon, 30 Nov 2009 11:55:51 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Christian Hentschel <chentschel@...et.com.ar>,
	netdev@...r.kernel.org
Subject: Re: SIP proxying: siproxd vs. Netfilter SIP nat

On Mon, 30 Nov 2009, Patrick McHardy wrote:

> No, this is deliberate since it diverges from the behaviour of other
> helpers. Usually they only allow to create RELATED connections between
> the two hosts communicating. If you set either of these module options
> to zero, they will allow completely foreign addresses to establish
> connections when those addresses appear in the SDP payload. You should
> usually use additional filters to f.i. only allow source addresses of
> your registrar:
>
> iptables -A FORWARD -m state --state RELATED \
> 		    -m helper --helper "sip" \
> 		    -s registrar-network/X -j ACCEPT

Please put documentation with all these tricks somewhere where people
looking for SIP NAT can find it. I see multiple threads where people have
struggled with setting up SIP proxying and have failed.

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