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Blocking packets with iptables

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andreas93

New Around Here
Hello i am trying to block a packet on my gameserver called banned_cdkey. But i cant get this command to work.
iptables -A INPUT -p udp -m string --algo bm --string "BANNED_CDKEY" --sport 20600 --dport 28960 -j DROP

Do i need to add a soruce ip of the computer or what am i doing wrong?
 
No the packet is not encrypted because it works fine on a ubuntu machine. Im trying to do the same for windows but with the asus router as firewall.
 
Is everything happening on your local network?

The INPUT chain is for packets destined for the router itself. The FORWARD chain is for packets passing through the router. Use -I instead of -A to put the rule on top.
Code:
iptables -I FORWARD -p udp -m string --algo bm --string "BANNED_CDKEY" --sport 20600 --dport 28960 -j DROP
 
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