Postado originalmente por
ccm
olha..... se vc quer bloquear tudo mesmo ... use :
##################################################################
# Politica Default para bloqueio geral e somente acesso a msn e porta 80
##################################################################
$IPTABLES -P INPUT DROP
$IPTABLES -P FORWARD DROP
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 1863 -j ACCEPT # Libera MSN
$IPTABLES -A FORWARD -p udp --dport 1863 -j ACCEPT # Libera MSN
$IPTABLES -A FORWARD -p tcp --dport 80 -j ACCEPT # Libera porta 80
$IPTABLES -A FORWARD -p udp --dport 80 -j ACCEPT # Libera porta 80
.....................
vc vai ter que ter muito cuidado ao implementar isso.... pois vai bloquear todo teu acesso interno tb....