This option makes possible to match some P2P packets
therefore helps controlling such traffic. Dropping all
matches prohibits P2P networks. Combined with conntrack,
CONNMARK and a packet scheduler it can be used for
accounting or shaping of P2P traffic.

Examples:
iptables -A FORWARD -m ipp2p --edk --kazaa --bit -j DROP
iptables -A FORWARD -p tcp -m ipp2p --ares -j DROP
iptables -A FORWARD -p udp -m ipp2p --kazaa -j DROP
