VirtualBox on wireless

On my Ubuntu Hardy Heron 8.04.1:
After installing VirtualBox 2

Install the Proxy ARP bridging daemon:

apt-get install parprouted

Enable ip forwarding:

sysctl net.ipv4.ip_forward=1

Create a tap interface:

VBoxTunctl -b -u $USER

(It will create one interface everytime you run it, so the first one will be tap0)

Bring up the interface and give it an ip address:

ip link set tap0 up
ip addr add 192.168.0.20/24 dev tap0

Bind tap0 to the wireless interface (eth1 on the hp, wlan0 on my dell)

parprouted eth1 tap0

In VirtualBox, Settings, Network set the network adapter attached to "Host Interface" "tap0"
If the procedure works, script it!

If it's not working you may have to add a route before starting VirtualBox:

sudo route add -net 192.168.0.0 netmask 255.255.255.0 tap0

To delete taps do

sudo VBoxTunctl -d <tap>