iptables match u32

Linux Advanced Routing and Traffic Control

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hello,

I try to use iptables rules to drop skype trafic. The
iptables rule is :
iptables -I FORWARD -p udp -m length --length 39 -m
u32 --u32 '27&0x8f=7' --u32 '31=0x01020304' -j ACCEPT

the problem I encounter is that i can't have the match
u32 for iptables. Could someone help me ?




	

	
		
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