Napster Block Ipchains Debian 2.2

[Martin Marconcini]

Hello:

        My firewall is using Debian and my damn boss asked me to block napster.

        i have eth0 internal and eth1 external.
        eth0 = 10.0.0.0/255.255.0.0
        eth1 = x.x.x.x

        I can't find a damn way to do it.

        ipchains -A input -j DENY -p tcp -s 0/0 -d 0/0 8888 -l  << Will not 
work!
:(

        Thanks!

        Martin.