iptables.rule

#!/bin/bash 

iptables -F
iptables -X
iptables -Z
iptables -F -t nat
iptables -X -t nat
iptables -Z -t nat

iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT

iptables -A INPUT -i eth0 -p icmp -j ACCEPT
iptables -A INPUT -i eth0 -p TCP --dport 22 -j ACCEPT
iptables -A INPUT -i eth0 -p TCP --dport 53 -j ACCEPT
iptables -A INPUT -i eth0 -p UDP --dport 53 -j ACCEPT
iptables -A INPUT -i eth0 -p TCP --dport 80 -j ACCEPT

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