#!/bin/sh

echo " enable ip forward...."

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

modprobe ip_tables

modprobe iptable_nat

modprobe ip_conntrack

modprobe ip_conntrack_ftp

modprobe ip_nat_ftp

echo " firwall starting...."

iptables -F

iptables -X

iptables -Z

iptables -t nat -F

iptables -t nat -X

iptables -t nat -Z

iptables -P INPUT DROP

iptables -A INPUT -i lo -j ACCEPT

iptables -A INPUT -i eth0 -s 192.168.0.0/24 -j ACCEPT

iptables -A INPUT -p tcp --dport 21 -j ACCEPT

iptables -A INPUT -p tcp --dport 20 -j ACCEPT

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

echo "disable forwarding...."

iptables -P FORWARD DROP

echo " enable lan to internet...."

iptables -A FORWARD -s 192.168.0.0/24 -p tcp -d 0/0 -i eth0 -j ACCEPT

echo " enable internet to lan ftp server...."

iptables -A FORWARD -s 0/0 -p tcp -d 192.168.0.7/24 --dport ftp -i eth1 -j ACCEPT

iptables -A FORWARD -p tcp -d 192.168.0.0/24 ! --syn -i eth0 -j ACCEPT

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE