#!/bin/bash

function echoerr {
	>&2 echo $1
}

if [ -z $1 ]; then
	echoerr "syntax:"
	echoerr "# $0 <iface>"
	exit 1
fi

iptables -t nat -A POSTROUTING -o $1 -j MASQUERADE
iptables -P FORWARD ACCEPT
sysctl -w net.ipv4.ip_forward=1