> iptables -A FORWARD -m string --string "X-Kazaa-Username:" -j DROP > iptables -A FORWARD -m string --string "X-Kazaa-Network:" -j DROP > iptables -A FORWARD -m string --string "X-Kazaa-IP:" -j DROP > iptables -A FORWARD -m string --string "X-Kazaa-SupernodeIP" -j DROP > iptables -A FORWARD -m string --string "Kazaa" -j DROP I recommend REJECT --reject-with tcp-reset. It will tell the clients that the connections is closed. If you drop the packets, the clients will try to send packets on and on for some time. Maciej Soltysiak