#!/bin/sh

 

PATH=/usr/sbin:/sbin:/bin:/usr/bin

 

#

# delete all existing rules.

#

iptables -F

iptables -t nat -F

iptables -t mangle -F

iptables -X

 

# Always accept loopback traffic

iptables -A INPUT -i lo -j ACCEPT

 

# Allow established connections, and those not coming from the outside

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

iptables -A INPUT -m state --state NEW -i ! eth1 -j ACCEPT

iptables -A FORWARD -i eth1 -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT

 

# Allow outgoing connections from the LAN side.

 

iptables -A FORWARD -m iprange --src-range 10.0.0.40-10.0.0.254 -j DROP  

iptables -A FPRWARD -m iprange --src-range 10.0.0.1-10.0.0.40 -j ACCEPT

 

iptables -A FORWARD -p tcp --dport 80 -m state --state NEW -m iprange --src-range 10.0.0.40-10.0.0.254 -j ACCEPT  

iptables -A FORWARD -p tcp --dport 443 -m state --state NEW -m iprange --src-range 10.0.0.40-10.0.0.254 -j ACCEPT  

iptables -A FORWARD -p udp --dport 53 -m iprange --src-range 10.0.0.40-10.0.0.254 -j ACCEPT

iptables -A FORWARD -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT

 

 

 

# Masquerade.

iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

 

# Don't forward from the outside to the inside.

iptables -A FORWARD -i eth1 -o eth1 -j REJECT

 

iptables -t nat -A PREROUTING -p tcp --dport 28960 -i eth1 -j DNAT --to 10.0.0.50:28960

iptables -t nat -A PREROUTING -p udp --dport 28960 -i eth1 -j DNAT --to 10.0.0.50:28960

iptables -t nat -A PREROUTING -p tcp --dport 52401 -i eth1 -j DNAT --to 10.0.0.50:52401

 

#proxy

#iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080

 

 

# Enable routing.

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