03-24-2009
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If you go into your settings-network part of the guest os, I.E. your OpenSolaris VM, you see a few options. In paticular when you just run a default VM with little configuration it is set to operate on an internal NAT. This will allow the VM to share your primary network address with your host machine, although it is behind an internal gateway.
If you want your VM to have a "real" IP address from your DHCP server, you need to configure it to bind to a virtual network device. This involves you installing a virtual network device. Under Windows, the Virtual Box can give you precise details how to do this, but the program is shipped with a driver that you can add which is a virtual network card to your hosts. Then you bind the VM (in the settings) to that paticular Virtual network card.
I hope this helps. I will dig into the VirtualBox docs later tonight and try to get specific details for you.