netdev - Re: [PATCH/RFC] netfilter: nf_conntrack

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Date:	Mon, 15 Nov 2010 10:51:50 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Kevin Cernekee <cernekee@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH/RFC] netfilter: nf_conntrack_sip: Handle quirky Cisco
 phones

On 14.11.2010 20:57, Eric Dumazet wrote:
> Le dimanche 14 novembre 2010 à 10:33 -0800, Kevin Cernekee a écrit :
>> On Sun, Nov 14, 2010 at 12:59 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>> I would like to get an exact SIP exchange to make sure their is not
>>> another way to handle this without adding a "Cisco" string somewhere...
>>>
>>> Please provide a pcap or tcpdump -A
>>
>> Existing nf_nat_sip: phone sends unauthenticated REGISTER requests
>> over and over again, because it is not seeing the replies sent back to
>> port 50070:
>>
>> 10:05:53.496479 IP 192.168.2.28.50070 > 67.215.241.250.5060: SIP, length: 723
>> E`...[..@.......C...........REGISTER sip:losangeles.voip.ms SIP/2.0
>> Via: SIP/2.0/
>>
> 
> Hmm, partial tcpdump... you should use" tcpdump -s 1000 -A" 
> 
> We miss the
> 
> Via: SIP/2.0/UDP 192.168.2.28:5060;branch=xxxxxxxx
> 
> 
> Maybe a fix would be to use this "5060" port, instead of hardcoding it
> like you did ?

I agree, using the Via header to route the response makes more sense.

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