My brother-in-law has a new computer with Ubuntu 9.10 installed in it, we put it together here at my house and it connected to the internet with no problems via my router here - just plugged the RJ45 in and it worked. So, basically, it's networking must be configured about right.
Now he's back home and wants to connect to the internet via an NTL cable modem (now Virgin Media). The cable modem model number is NTL 250 - Model E08c007. When the RJ45 from the cable modem is plugged into his old Windows machine it works, when it's plugged into his new Ubuntu machine it doesn't work.
Can anyone tell me how to get this to work? Is it a question of telling NTL/Virgin that there's a new machine (with a new MAC address) connected or does the Cable Modem expect authentication across the ethernet cable, or what?