#!/bin/bash

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -F -t nat
iptables -t nat -A PREROUTING -p tcp --dport 31337 -j DNAT --to 192.168.100.40:31337
iptables -t nat -A POSTROUTING -j MASQUERADE