said by HarryH3:
I seem to recall reading somewhere that the DOCSIS 3.0 standard disallows end-user configuration.
What? The CABLE side is not, and has never been, user configurable. There's nothing in the DOCSIS configuration a user needs
Cable ISP's typically link the MAC address of the cable modem to their equipment.
As I've said, US cable operators stopped doing this a long time ago as it was an unnecessary administrative headache. The HFC MAC, i.e. the network identity of the modem, is what's set in their system. That's how they identify an authorized modem, and link it to an account. What the user hangs off of it is not tracked by the ISP -- it will be temporarily tracked by the modem to enforce CPE limits (eg. one connected device) (a reboot will forget it)