That actually reminds me I can remember reading about quite a big problem with my ISP a few years back where people were getting free internet by buying dodgy modems. I think they were basicly using other peoples mac addresses and the ISP was giving them the subscribers ip address and letting them online.
Simplest way I can put it is someone could buy a dodgy modem and steal someone elses internet they could pretty much do anything they wanted and the real cable subscriber would be the one blamed for it.
I'm not sure if that was ever fixed but presumably it's still a possibility.
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