Disable everything but VirtualBox bridging on physical interface.
I'm trying to set up something like this, but on Debian and with VirtualBox:
The guide shows how to prevent Windows from using a network card, except from allowing VMWare to bridge it to a virtual machine, so that the Windows computer would be shielded from any traffic through that adapter (since in the guide, that's the WAN network).
How would I go about setting this up on Debian? I'm not trying to set up a firewall like he is, rather some virtual servers that would be on a different subnet to the host's main connection on the internal side of a separate firewall.
Hopefully this diagram will make it clearer: