I'm using PF under OpenBSD 4.1 to classify traffic generated by many
users and assign it to queues with different priority.
The only problem I have is how to recognize the RTP streams of VoIP
(both SIP and Skype), as there are non predefined ports or servers.
I thought to use the TOS (or DiffServ) field but it's too easy for the
users to abuse it and mark all desired traffic as high-priority.
I thought that a solution could be to use the TOS field but ONLY FOR
SMALL PACKETS (RTP flows are made by many small packets).
So, is there any way to specify a minimum packet size in a PF rule?
Any other suggestions on how to recognize RTP flows with a PF rule?
Thanks.
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|ederico Giannici http://www.neomedia.it
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