Thanks for the responses everyone!

As for the Gamer's Internet Tunnel it doesn't seem to be supported in Windows 7, and when I run it I don't get any options under the "Look at frames on which device?" I'm continuing to look for other software that provide a similar service.

I've seen some posts around UDP broadcasts, one in particular mentions adding a "rule" to allow broadcast traffic through. I'll see if I can pick the brain of my network guy here at work as well (cursed day time job getting in the way of my hobbies).

Taking the use of work resources for personal use to a whole new level :)