my buddy brought his over
However I already had the 2nd modem so it wasn't a problem for me..
Hey Aristo, do you mean that in both of your threads, the 2nd modem was your buddies? If that was not so, that just destroys some of what I understood about the ISP networks.
I figure that when you suscribe to their service, you will register the MAC address of the modem with their networks. Until you unsuscribe, that address is tied to you and your contract with the company. Since your friend most likely is using the same service, his modem also had it's MAC address registered with the ISP's network. So, I would not think that there would be any problem with that modem working at your house also (within the ISP's network). Kind of like a cell phone.
Of course this could be wrong, which is whay I am asking if the second modem in both of your threads are indeed your buddie's?