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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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.7 (GNU/Linux)
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