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Forum Discussion

robotman's avatar
robotman
Aspirant
Jan 06, 2020

Fixed IP for connected device?

I have a number of devices that get DHCP addresses from my cable modem. I'd like to assign one of these devices a fixed address or at least "lock" the address to the device it so the address doesn't change whenever I lose power.

 

I must be missing something, but I don't see any settings in the web GUI to configure *any* network settings. With my original Xfinity modem I was able to adjust network settings, change DNS settings, etc. I see nothing on the CM1150V.

 

Is there some hidden setting I'm missing? In other words, how do I get to *any* network settings on this box?

 

Thanks.

3 Replies

  • antinode's avatar
    antinode
    Guru
    Jan 06, 2020

    > [...] I see nothing on the CM1150V.

     

       Perhaps that's because a CM1150V is a modem, and address reservation
    is a router function.  (Strictly, it's a DHCP server function, but, most
    likely, your DHCP server is in your router.)

     

    > Is there some hidden setting I'm missing? [...]

     

       It's "hidden" in your (unspecified) router.

     

    > [...] how do I get to *any* network settings on this box?

     

       Typically, you don't; you get to them on your (unspecified) router.

     

       If Netgear made your (unspecified) router, then visit
    http://netgear.com/support , put in your (actual) model number, and look
    for Documentation.  Get the User Manual.  Read.  Look for "Address
    Reservation" (or whatever)?


       If you don't _have_ a router (perhaps related to your believing that
    your (unspecified) "my original Xfinity modem" was only a modem, and not
    a modem+router), then you'd need to _get_ a router to use with your
    CM1150V modem (which is only a modem).

    • robotman's avatar
      robotman
      Aspirant
      Jan 08, 2020

      Thanks for the response. I understand the difference, and that makes sense, but lets say I'm *only* using the Negear CMV... with my cable provider and plug in my laptop directly to the modem. I still get issued an IP address, get DNS etc.  As indicated in this diagram:

       

      https://www.netgear.com/home/products/networking/cable-modems-routers/CM1150V.aspx

       

      I would have thought there was some settings for that? For example if I wanted to use an alternate DNS provider?

       

       

      • antinode's avatar
        antinode
        Guru
        Jan 08, 2020

        > [...] plug in my laptop directly to the modem. [...]

         

        > I would have thought there was some settings for that? [...]

         

           Not really.  You should be able to get to the settings on any DOCSIS
        modem at "192.168.100.1", but I doubt that you'd find what you seek
        there.  Without a router, your computer negotiates directly with your
        ISP.  (With a router, the router negotiates directly with your ISP.)

         

        > [...] I still get issued an IP address, get DNS etc.

         

           From your ISP.

         

        > [...] For example if I wanted to use an alternate DNS provider?

         

           Tell your (unspecified) "my laptop"; the modem isn't interested (or
        involved, except as a conduit).