#!/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