On 8/31/2012 12:21, Matt Graham wrote:
> From: Derek Trotter <expat.arizonan@gmail.com>
>> Since they [the ISP] already know what cable modem you're using,
>> why do they also require a NIC [behind the cable modem] to be
>> registered before it can be used?
> IIRC, the original reason was money.  The ISP would allow the cablemodem to
> transmit to 1 NIC with 1 MAC addr, and if you wanted additional devices to be
> able to talk to the cablemodem, you had to pay the ISP more.  ISPs didn't make
> nearly as much money doing this as they thought they would, because
> NAT/IP-Masqing are relatively easy to do.
>
> They may retain some language in their contracts/TOS/whatever that say "You're
> allowed to connect ONE DEVICE to this network".  If they've got that language,
> they have a way to dump any customer they don't like who's ever used more than
> 1 network device at a time through their service.
Thanks for clearing it up for me.  I'm guessing if an isp had that one 
device rule in their contracts and used it to get rid of a customer, 
they'd be asking for a lawsuit.  The customer could argue they're being 
unfairly singled out since most everyone has multiple devices behind a 
router.
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