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dba31's avatar
dba31
Aspirant
Apr 15, 2020
Solved

how to connect CM500v modem to cg3000 so as to get wifi and additional lan ports

Hi, I'm reasonably IT savvy but not when it comes to the networking side. I have a CM500V as supplied by my ISP but it doesn't have wifi and it won't connect to a switch allowing more than 1 port be ...
  • antinode's avatar
    antinode
    Apr 15, 2020

    > [...] I have a CM500V as supplied by my ISP but it doesn't have wifi
    > and it won't connect to a switch allowing more than 1 port be active.
    > [...]

     

       Because it's a modem, not a modem+router.

     

    > [...] I need to be able to connect more than just a single device.
    > [...]

     

       So you need a (NAT) router which you can connect to the CM500V.

     

    > [...] I have my old CG3000 [...]

     

       There is a router in there, but it has no Ethernet WAN/Internet port,
    which makes it generally useless to you.

     

    > Does this make sense? [...]

     

       The desire is reasonable, but the required hardware is missing.


    > [...] just plugging them in this way doesn't seem to work

     

       With no Ethernet WAN/Internet port on your "my old CG3000", you're
    out of luck.  A plain-old router (with an Ethernet WAN/Internet port) is
    what you need to use with a CMxxxx (modem).  (Or even a DSL modem+router
    which has an Ethernet WAN/Internet port.)

dba31's avatar
dba31
Aspirant
Apr 15, 2020

actually, further to this, should I be able to just plug a switch e.g. d-link DGS-108 into this and run multiple devices from that? Should the CM500V be able to handle the multiple connections?

thanks.

antinode's avatar
antinode
Guru
Apr 15, 2020

> [...] Should the CM500V be able to handle the multiple connections?

 

   Unlikely.  Only if your ISP provides you with multiple external IP
addresses, instead of the usual one (for residential service).

 

   A network switch would solve the basic connection problem, but not
the problem of sharing your single external IP address.

 

   Generally, for multiple devices, you need a (NAT) router.

 

> So you need a (NAT) router which you can connect to the CM500V.

 

   Still true.

 

   On the bright side, your "my old CG3000" might not be entirely
useless.  You might be able to employ it as a wireless access point (not
as a full-function router).  See, for example:

 

      https://community.netgear.com/t5/x/x/m-p/1463500


That's written for a C6300-as-WAP, but the steps are about the same for
any other router (any make/model) which lacks a one-step WAP option.

 

   But you'd still need a (NAT) router.