There was in fact a board game, produced by (I think) Steve Jackson games. It was called Hackers, and was great fun. Out of print now, I recommend finding a copy. It was a err.. sort of network simulator. Yes. Definately a simulator :)

The only trouble with trying to find it on the net is that you end up with a lot of links to this fascinating article.

Your game sounds like a good idea! I'd like to see it when it's done.

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Jeremy
I didn't believe in evil until I dated it.