New modem, no registration?

Discussion in 'Networking Issues' started by incubus, Sep 5, 2008.

  1. incubus

    incubus LI Guru Member

    This seems baffling. I'm on Comcast Cable in Denver, and my SB5120 modem (owned, not rented) got fried by a nearby lightning hit. I replaced it with a Linksys CM100 (which outwardly looks like the exact same unit with different plastic around it and a smaller wall wart).

    When I turned the new modem on, it simply connected, got its IP address, and was off and running. No modem registration page, no error message...No machine on my system has ever had any Comcast-supplied software on it, and I haven't communicated the modem's MAC address or S/N to them. So how do they know where my packets are coming from? Or do they?

    I'm running Tomato 1.17 on a WRT54GL; does Tomato maybe have some way of automating modem registration? Thanks...

  2. HennieM

    HennieM Network Guru Member

    I know nothing of Comcast, nor of CM100s, but if your router is controlling the modem, it's your router that does the connecting. The modem only supplies the modulation necessary to talk the language of the hardware line (DSL, cable, whatever), but your router's MAC, etc. are at play.
  3. incubus

    incubus LI Guru Member

    OK, but the modem does have a MAC address, and on previous modem installations I've always been required to register that -- plus its S/N -- with Comcast before it would connect.

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