network config bash file

#!/bin/sh

#

# internet connection sharing wlan0 is the gate way

# eth0 is the lan port this might use a straight ethernet cable to a router wan port or a switch or a single PC

# 192.168.2.2 is the port that is being used by the lan for access I changed it to 192.168.2.254 and set fixed addresses for the wan and router

#

# change wlan0 to ppp0 and you can use this for mobile broadband connection sharing

#

ip link set dev eth1 up

ip addr add 10.42.0.1/24 dev eth1

sysctl net.ipv4.ip_forward=1

iptables -t nat -A POSTROUTING -o ppp0 -s 10.42.0.0/24 -j MASQUERADE

iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 3074 -j DNAT --to-destination 10.42.0.2

iptables -t nat -A PREROUTING -i ppp0 -p udp -m multiport --dports 88,3074 -j DNAT --to-destination 10.42.0.2

iptables -A FORWARD -i ppp0 -d 10.42.0.2 -p tcp --dport 3074 -j ACCEPT

iptables -A FORWARD -i ppp0 -d 10.42.0.2 -p udp -m multiport --dports 88,3074 -j ACCEPT