> If this is what you're thinking, it sounds pretty good, except, of course,
> that it relies on writing drivers for both sides.  You have to do NAT on the
> host side if you want to get to the outside world and don't have a IP to do
> it, but if you don't, it's pretty simple routing.

I think UML (User Mode Linux - http://user-mode-linux.sourceforge.net/ )
uses a PPP link for this. (Ah...just checked, it uses a SLIP link) Would
it work if you write a serial device (is that a simpler option than
writing a dummy ethernet card?)?

You could then configure the host and guest OSs to run PPP/SLIP over the
dummy serial link using their normal tools. You also configure the host OS
to NAT as necessary using its' normal tools.

Plex86 might be able to share documentation, if not code, with UML in this
regard (at least on the host setup).

regards,

jb


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