Regras para bloquear protocolos P2P com o firewall iptables no Linux:

/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto bittorrent -j DROP
/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto directconnect -j DROP
/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto gnutella -j DROP
/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto edonkey -j DROP
/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto bearshare -j DROP
/usr/sbin/iptables -I FORWARD -p tcp -m layer7 --l7proto winmx -j DROP