#!/bin/bash 
# Name: tapctrl 
# Usage: tapctrl start|stop
# Provides: tap for virtualbox over external network including wireless 
# Short-Description: set up tap device for sharing wifi interface with vbox 
# Description: create a virtual tap interface, give it an IP address, set up iptables to masquerade through the default 
#                      device and set up proxy arp with parprouted daemon to enable correct routing
# Author: Jack Knight - Open Source Migrations Ltd, UK (http://www.osml.co.uk) 
##############################
# Set up variables here: 
DESC="Virtualbox IP tap" 
PATH=/sbin:/bin:/usr/sbin:/usr/bin 
TUNDEVICE=tap1 # Arbitrary, but must match device used in virtualbox network device setting 
LANDEVICE=eth1 # Adjust to match your network device - may be eth0, eth1 ath0, wlan1 etc. 
IPADDR=172.16.254.254 # arbitrary, but make sure you pick something from an unused subnet 
case "$1" in start|restart|force-reload) 
	echo -n "Starting $DESC: " 
	tunctl -t $TUNDEVICE -u $USER 
	ip link set $TUNDEVICE up 
	ip addr add $IPADDR dev $TUNDEVICE 
	arp -Ds $IPADDR $TUNDEVICE pub 
              iptables -t nat -A POSTROUTING -o $LANDEVICE -j MASQUERADE 
              iptables -t nat -P POSTROUTING ACCEPT   # allow other if's to work 
	echo 1 > /proc/sys/net/ipv4/ip_forward 
	echo 1 > /proc/sys/net/ipv4/conf/$TUNDEVICE/proxy_arp 
	parprouted $LANDEVICE $TUNDEVICE 
stop) 
	echo -n "Stopping $DESC: " 
	iptables --table nat -F 

	killall parprouted 
	ip link set $TUNDEVICE down ;; 
*) 
	N=/etc/init.d/$NAME 
	echo "Usage: $N start|stop" >&2 
	exit 1 
	;; 
esac 
exit 0