I have a computer on my network that serves as a Host PC for a VirtualBox Guest VM. Both the Host PC and Guest VM run Windows 7.
I would like to block the Guest VM from accessing the Host PC as well as the rest of the LAN. The Guest VM should have access to the Internet only. The purpose of this is so I can test questionable programs in the VM without anything escaping. I will need Internet access from inside the VM, but I do not want to have any access to the rest of the LAN or the Host PC, from inside the VM.
My router runs Tomato firmware, in case that is relevant.
Does anyone know how I can accomplish this?