#!/bin/sh

IPT=/sbin/iptables

$IPT -F

#policies

$IPT -P OUTPUT ACCEPT
$IPT -P INPUT DROP
$IPT -P FORWARD DROP

#allowed inputs

$IPT -A INPUT --in-interface lo -j ACCEPT
$IPT -A INPUT -p tcp --dport 113 -j ACCEPT
$IPT -A INPUT -p tcp --dport 22 -j ACCEPT

#allow responses