[QUOTE="Art"]\nWhy?[/QUOTE]\n\nObviously they could come around your house and check. Or they could \nsetup remote cameras/antennas to check. Not exactly cost-effective.\n\nGo and find all the relevant RFCs (NAT, ethernet, wireless bridging) etc \nand show me how they could detect it? To all intense purposes all the \nISP sees is the traffic from ISP <-> Router. (This isn't strictly true \nof course. BUT routers could obfuscate the client data if need be or \nyou could use local proxies).