NATing with VirtaulBox and NetworkManager
- From: Brian Millett <bmillett gmail com>
- To: Network Manager <networkmanager-list gnome org>
- Subject: NATing with VirtaulBox and NetworkManager
- Date: Thu, 08 Nov 2007 15:08:21 -0600
For what it's worth,
I use VirtualBox on my fedora laptop. Now, I need to access the guest OS from
the host as well as access the host from the guest. Using the normal "NAT" that
is built into VirtualBox doesn't allow that. I also can not use the Bridging
method explained in the manual, so I've done the following that works with
I need to have the guest access the net wither I'm using wireless or switch to
wired. I setup a 'tap0' device that I assign an address, then I make sure that
the iptables firewall will let me NAT and setup MMASQUERADE for what ever device
is active. You just need to assign a static ipaddr to the guest and make sure
that the gateway on the guest is the ipaddr of the tap0 device.
Any suggestions for improvement are greatly encouraged.
I've setup a dispatcher to do all of the work for me.
if [ -x /usr/bin/logger ]; then
LOGGER="/usr/bin/logger -s -p user.notice -t NetworkManagerDispatcher"
ip link show | grep ": $NAME" | while read L; do
## chown the device for virtualbox
chown root.vboxusers /dev/net/tun
chmod g+rw /dev/net/tun
# check if tap0 is already defined
## if not defined, then create it using openvpn
## and give it an address
if [ -z "$interface" ]; then
openvpn --mktun --dev tap0
#VBoxTunctl -t tap0 -u bpm
ip link set up dev tap0
ip addr add 192.168.89.1/24 dev tap0
ip route add 192.168.89.0/24 dev tap0
## make sure the active NIC is the one routing.
case "$OPERAND" in
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -F
iptables -t nat -A POSTROUTING -o $NIC -j MASQUERADE
echo 0 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -F
Brian Millett - [ Col. Ben Zayn & Garibaldi, "Eyes"]
"Mr. Garibaldi. Very good."
'You know me?'
"Intimately. Fix you a drink?"
'I don't drink.'
"Really? Good. It's a vile habit when abused. Makes a soldier weak.
Gets him in a *lot* of trouble."
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