Virgin modems don't bind to a mac address any more so it won't be that. I have a setup very much like steves and that all works fine with ubuntu and window machines.
you might want to conder geting hold of a network switch, hoking it up to the windows and ubuntu machine, giving themboth a static ip address and then just seeing if they can ping each and browse shares just to check that the network cards are both working fine. I believe - although i'm not 100% on this, you might need a router - that you can then plug the cable modem into the switch and give the machines internet. Dan
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