Tomato

#FFXI Ping
iptables -I INPUT 2 -s 202.67.53.0 -p icmp -j ACCEPT

J/K

I know on PS2 there was an option for disabling connection detection. Maybe this is why my routers where slower when playing final fantasy with respond to ping enabled. Servers flooding my IP. Then again it could just as easly be the router mistaking the game packets as ping attempts.