#!/bin/bash

###########################################################
#
#Enter the ip of the target you wish to make a tunnel with.
#By ip address or hostname
#
target=74.79.121.210
port=22
#
###########################################################
# suggestions contact rich at lehcar.no-ip.org
# with thanks to Billy T (for idea and assistance)
###########################################################
#load module
/usr/bin/sudo /sbin/modprobe tun
#load remote module
/usr/bin/ssh -p $port $target "/usr/bin/sudo /sbin/modprobe tun"
/bin/sleep 1

/usr/bin/sudo /usr/bin/autossh -p $port -M 0 -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -fw 0:0 $target /bin/true
/bin/sleep 4
/usr/bin/ssh -p $port $target "/usr/bin/sudo /sbin/ifconfig tun0 192.168.5.2 pointopoint 192.168.5.1 netmask 255.255.255.252 broadcast 192.168.5.3"
/usr/bin/sudo /sbin/ifconfig tun0 192.168.5.1 pointopoint 192.168.5.2 netmask 255.255.255.252 broadcast 192.168.5.3
/usr/bin/sudo /usr/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
/usr/bin/sudo /usr/sbin/iptables -A FORWARD -i eth0 -o tun0 -m state --state RELATED,ESTABLISHED -j ACCEPT
/usr/bin/sudo /usr/sbin/iptables -A FORWARD -i tun0 -o eth0 -j ACCEPT

/usr/bin/ssh -p $port $target "/usr/bin/sudo /usr/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE"
/usr/bin/ssh -p $port $target "/usr/bin/sudo /usr/sbin/iptables -A FORWARD -i eth0 -o tun0 -m state --state RELATED,ESTABLISHED -j ACCEPT"
/usr/bin/ssh -p $port $target "/usr/bin/sudo /usr/sbin/iptables -A FORWARD -i tun0 -o eth0 -j ACCEPT"