#!/bin/sh
INTIF=eth0
EXTIF=ppp0
iptables --flush
iptables -A INPUT -j ACCEPT
iptables -A FORWARD -j ACCEPT
#iptables -A FORWARD -i $EXTIF -o $INTIF -j ACCEPT
iptables -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE

echo 1 >/proc/sys/net/ipv4/ip_forward