I'd like to use m0n0wall inside a (VirtualBox) VM to play about with and see what it can do. Ultimately the goal is to have a number of virtual machines connected to a internal virtual network which goes through to the m0n0wall VM, and then the m0n0wall box connected to the internet through NAT or a bridged addaptor on my host machine. I can find out how to set the LAN and WAN addresses, but this seems to be only for using m0n0wall as a router intead of attached to another router.

Let's see if I can diagram this:
[Virtual Machine]->->-Internal (VM Only) Network ->->-[m0n0wall VM]->->-Bridged/NAT Addaptor->->-["real" router]->->-Internet.

Can anybody suggest how I should do this or am I thinking m0n0wall isn't meant to be used like this?