My provider tells me that i cannot have 2 modems in my house since it would require a separate bill since it would be a separate line. I already have 2 coax cables that i can connect to the modems, which come from 1 single line that is then split with a splitter in my garage. Both coax cables work with the service-provider provided modem, but it doesnt work with my own. I DONT WANT TO run ethernet across the stairs and half my house. How do i solve this problem? Can i just spoof my 2nd modem's serial and mac? Or will it not work?