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Changing modem configuration

Discussion in 'Networking' started by Lisadw1966, Feb 27, 2019.

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  1. Lisadw1966

    Lisadw1966 Thread Starter

    Feb 27, 2019
    Hi all. I recently changed internet providers and kept my existing modem. I have no idea how to change settings in the modem to get the new internet.
  2. TerryNet

    TerryNet Moderator

    Mar 23, 2005
    First Name:
    If you know nothing about your new ISP you will need to ask them about their service. You may not even be able to use the modem if, for example, you switched from DSL to cable.
  3. dlipman


    Feb 14, 2013
    First Name:
    @Lisadw1966 :

    You haven't provided any specific details so only generic information can be provided.

    • A modem is specific to the technology of the ISP. A cable modem can't be used on DSL. Likewise a Dial-Up Network ( aka; DUN ) modem can't be used on DSL and cable.
    • A Dial-Up modem will use PPPoE Authentication and it will require an ISP account and password.
    • A modem could be a standalone device or it can be combined with a router into one device. Cable providers have lists of devices that can work on their network.
    • Modems are not used in FTTP situations such as FiOS. They use an Optical Network Terminal ( ONT ).
    • There are different protocols for DSL. An Asynchronous DSL modem can't be used in place of a Very High-Speed DSL modem
    • One can not take a cable modem and use it on another cable ISP's system and expect it to work. Cable providers use MAC Authentication. That would require a subscriber to call the cable ISP, prove they have a valid subscription, and provide their cable modem's MAC address ( aka; CMAC ) such that the cable provider can allow that device to work on their network.
    • A cable ISP may not accept a DOCSIS v2.0 modem and may require a DOCSIS v3.x modem.
    • A DSL modem may use PPPoE Authentication and it will require a DSL ISP account and password.
  4. plodr


    Jun 27, 2014
    First Name:
    First you check if your new ISP supports your old modem.

    If they do, then you call the ISP and tell them the MAC address of the modem. It might take 24 hours for the internet signal to become active.
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