OS X network bridge

bridge.sh

#! /bin/sh
# ######################################
#  coded by Nat!
#  2013 Mulle kybernetiK
#  GPL

command=${1:-start}
shift
proxyarp=${1:-no}
shift

start()
{
	sysctl -w net.inet.ip.forwarding=1
	sysctl -w net.inet.ip.fw.enable=1
	if [ "$proxyarp" != "no" ]
	then
		sysctl -w net.link.ether.inet.proxyall=1
	fi

	ifconfig bridge1 create
	ifconfig bridge1 addm en0
	ifconfig bridge1 addm en1
	ifconfig bridge1 up
	if [ $? -eq 0 ]
	then
		syslog -s "Mulle Ethernet Bridge is up"
	else
		syslog -s "Mulle Ethernet Bridge failure"
	fi
}


stop()
{
	ifconfig bridge1 destroy

	sysctl -w net.inet.ip.forwarding=0
	sysctl -w net.inet.ip.fw.enable=0
	sysctl -w net.link.ether.inet.proxyall=0

	syslog -s "Mulle Ethernet Bridge is down"
}



case "$command" in
	start*)	start
		;;
	
	stop*)	stop
		;;
esac