start_qemu_networking.sh

#!/bin/sh
#
#   Scrict basic code was taken from http://en.wikibooks.org/wiki/QEMU/Networking and modified.
#   All copyrights belong to the original authors of the wikibooks article
#
#       script to bring up the tun device in QEMU in bridged mode
#       first parameter is name of tap device (e.g. tap0)
#       second parameter is the name of the user that runs the script
#
#
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#
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echo "0/6.    START QEMU NETWORK CONNECTION ----- ----- ----- ----- ----- START QEMU NETWORK CONNECTION"
sbinPath=/usr/sbin
#
# First take eth0 down, then bring it up with IP 0.0.0.0
#
echo "1/6.    First take eth0 down, then bring it up with IP 0.0.0.0 "
ifconfig eth0 down
ifconfig eth0 0.0.0.0 promisc up
#
# Bring up the tap device (name specified as first argument, by QEMU)
#
echo "2/6.    Bring up the tap device $1 for the user $2"
${sbinPath}/openvpn --mktun --dev $1 --user $2
ifconfig $1 0.0.0.0 promisc up
#
# create the bridge between eth0 and the tap device
#
echo "3/6.    Create the bridge between eth0 and the tap device"
${sbinPath}/brctl addbr br0
${sbinPath}/brctl addif br0 eth0
${sbinPath}/brctl addif br0 $1
#
# only a single bridge so loops are not possible, turn off spanning tree protocol
#
echo "4/6.    Only a single bridge so loops are not possible, turn off spanning tree protocol"
${sbinPath}/brctl stp br0 off
#
# Bring up the bridge with dhclient
#
echo "5/6.    Bring up the bridge with dhclient (this may take a few seconds..)"
#dhclient -r br0
dhclient br0
#
# stop firewall - comment this out if you don't use Firestarter ... disabled
#
#/sbin/service firestarter stop
echo "6/6.    FINISHED ----- ----- ----- ----- ----- ----- ----- ----- FINISHED"