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From: Alessandro Oliveira Ungaro <x-arnie@ccpbr.org>
To: lartc@vger.kernel.org
Subject: [LARTC] QoS and VoIP
Date: Fri, 11 Mar 2005 14:04:48 +0000	[thread overview]
Message-ID: <4231A580.8080707@ccpbr.org> (raw)

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Hi all,

I made some filters on tc to match the VoIP traffic based on RTP packet
RFC 1889.

The only patern I found was the rtp version and the payload type wich
identify the codec. The u32 rules are:

- - match ip protocol 0x11 0xff -> UDP
- - match u8 0x80 0xc0 at 28 -> RTP version 2 (two fists bits '10' of the
byte)
- - match u8 0x61 0x7f at 29 -> Codec number 97 (seven bits of the byte
without the first bit)

This with a iptables marking the packet with dport and sport > 1024 work
fine. But if I have more codecs I need more filter rules.

Some idea to match better?

Thanks.

x-arnie
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             reply	other threads:[~2005-03-11 14:04 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-11 14:04 Alessandro Oliveira Ungaro [this message]
2005-03-12 15:50 ` [LARTC] QoS and VoIP Ed Wildgoose

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