iptables для proxy server

Политики по умолчанию.
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP      
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

        
SSH eth0
iptables -A INPUT -p tcp -i eth0 --dport 22 -j ACCEPT

SAMBA eth0
iptables -A INPUT -p TCP -i eth0 --dport 137:139 -j ACCEPT
iptables -A INPUT -p UDP -i eth0 --dport 137:139 -j ACCEPT

DNS eth0
iptables -A INPUT -p TCP -i eth0 --dport 53 -j ACCEPT
iptables -A INPUT -p UDP -i eth0 --dport 53 -j ACCEPT

HTTP
iptables -A OUTPUT -p tcp -o ppp0 --dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp -o ppp0 --dport 443 -j ACCEPT