#!/bin/bash
echo "clean all rules before"
iptables -F
iptables -X
echo "setting up default rules"
iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
echo "allow local address"
iptables -A INPUT -i lo -p all -j ACCEPT
echo "allow now connection"
iptables -A INPUT -p all -m state --state ESTABLISHED,RELATED ...