Fabian,

Try adding the following Iptable rule with a filter for the mark value..
iptables -t mangle -A PREROUTING -p udp -m lenght <length value> -j MARK --set-mark 1

Regards,
Vinod C


Fabian Gervan wrote:

How i can classify sip traffic (voip)??
I try dst 5060 udp port, but dont'work. sip sesion use dynamic port.

Sniffing packets with windows net-peeker, I see that packets lenghts
is always=87
How i can filter, by  packet lenght, with u32?

Regards
Fabian
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