netdev - Re: match SIP & RTP packets

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Date:	Thu, 03 Dec 2009 12:11:20 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Lorenzo Allegrucci <lorenzo.allegrucci@...inicom.it>
CC:	netfilter@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: match SIP & RTP packets

Lorenzo Allegrucci wrote:
> 
> Hi all, it's not clear to me whether nf_conntrack_sip does SIP and RTP
> connection
> tracking or just SIP.. can you clarify?
> I need to match both SIP and RTP packets and I was wondering if the rule
> below would satisfy my requirements:
> 
> iptables -t mangle -A FORWARD -o eth0 -m helper --helper sip -j CLASSIFY
> --set-class 1:1

Almost, this will match on RTP packets and incoming signalling
connections (-m helper matches on expected connections). What's
missing is the original signalling connection on port 5060.
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