The following rule has worked for me. http://www.securityfocus.com/infocus/1531 $IPTABLES -A FORWARD -p tcp -m string --string X-Kazaa-Username: -j REJECT --reject-with tcp-reset $IPTABLES -A FORWARD -p tcp -m string --string X-Kazaa-Network: -j REJECT --reject-with tcp-reset $IPTABLES -A FORWARD -p tcp -m string --string X-Kazaa-IP: -j REJECT --reject-with tcp-reset $IPTABLES -A FORWARD -p tcp -m string --string X-Kazaa-SupernodeIP: -j -j REJECT --reject-with tcp-reset -----Original Message----- From: tracker [mailto:jaws@xxxxxxxxxxx] Sent: Wednesday, May 21, 2003 3:20 PM To: netfilter@xxxxxxxxxxxxxxxxxxx Subject: how to filter kazaa Hi all, Im new to this list and iptables. I would like to know how to filter kazaa. Thanks. Jaws