In the network options for the MD, the options I use are...
Attached to: Bridged Adapter
...and then in advanced...
Adapter Type: PCnet-AST III (Am79C973)
Some of the options will either not work at all, or begin to PXE boot and than flake out, but this config seems to work.
I will say that once everything is installed and running, I find the install to be a bit ropey, for example the mouse doesn't seem to respond to clicks (although you can move it, albeit a bit jerky sometimes), but keyboard seems to work. I also can't change channels in myth, either with the keyboard or the mouse - oooo, I'll try my N800 in a minute, see if that give me any joy!
In 0710, this setup worked perfectly, I don't know what's changed.