#! /bin/bash
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp
/sbin/iptables -F -t filter
/sbin/iptables -F -t nat
/sbin/iptables -P INPUT ACCEPT
/sbin/iptables -P OUTPUT ACCEPT
/sbin/iptables -P FORWARD ACCEPT
/sbin/iptables -t nat -P PREROUTING ACCEPT
/sbin/iptables -t nat -P POSTROUTING ACCEPT
/sbin/iptables -t nat -P OUTPUT ACCEPT
# ALLOW ALL in PRIVATE NET
/sbin/iptables -A INPUT -i lo -j ACCEPT
/sbin/iptables -A INPUT -i eth1 -j ACCEPT
# FTP
/sbin/iptables -A INPUT -m limit --limit 100/s --limit-burst 100 -p tcp --dport 21 -j ACCEPT
# SSH & TELNET
/sbin/iptables -A INPUT -p tcp --dport 22 -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 25 -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 110 -j ACCEPT
# VPN
#/sbin/iptables -A INPUT -p tcp --dport 1723 -j ACCEPT
#/sbin/iptables -A INPUT -p gre -j ACCEPT
# WWW
/sbin/iptables -A INPUT -m limit --limit 100/s --limit-burst 100 -p tcp --dport 80 -j ACCEPT
# MYSQL
# /sbin/iptables -A INPUT -p tcp --dport 3306 -j ACCEPT
# SOCKS5
# /sbin/iptables -A INPUT -p tcp --dport 8039 -j ACCEPT
# ICMP(PING)
/sbin/iptables -A INPUT -p icmp --icmp-type echo-request -j REJECT
/sbin/iptables -A INPUT -p icmp --icmp-type ! echo-request -j ACCEPT
# NAT
/sbin/iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE
# DNAT SQL-SERVER & RADMIN to PRIVATE NET
/sbin/iptables -A PREROUTING -t nat -p tcp -s ! 192.168.0.0/24 --dport 4899 -j DNAT --to 192.168.0.2:4899
/sbin/iptables -A PREROUTING -t nat -p tcp -s ! 192.168.0.0/24 --dport 5000 -j DNAT --to 192.168.0.3:4899
iptables -t nat -A PREROUTING -p tcp -m tcp -s 192.168.0.0/24 --dport 80 -j DNAT --to 192.168.0.1:3128
# DENY OTHERS
/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -j MIRROR