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Forum Discussion
CM1000 is not talking to routers over Ethernet
I bought a CM1000 from Best Buy this afternoon. This is to replace a Motorola cable modem I've had for a number of years with something faster. After a bunch of fooling around with Comcast the CM10...
Snarky replies aren't very helpful...
"talking to my network" means just what you suppose it means - through the Ethernet connection. Connect it to either router or the switch and you get a red light. Connect the cable modem directly to the laptop I'm using and you get a green light. Red light = no joy in communicating with anything over Ethernet.
> Snarky replies aren't very helpful...
Not answering specific questions is what's really unhelpful in these
situations. Along with information-free problem descriptions.
> [...] Connect it to either router or the switch and you get a red
> light.
Still wondering what that mysterious "router" might be,
And what is your "the switch"? Connecting a modem directly to a
network switch would very likely cause trouble with multiple client
devices. Why involve it, whatever it is?
> [...] Connect the cable modem directly to the laptop I'm using and you
> get a green light. [...]
Yeah, I got that the first time. Hence the other (still unanswered)
questions.
Cable Modem -> Router (provided by Comcast) -> Router (provided by me) -> Gigabit switch.
Various computers are connected to the second router and the switch, either via Wifi or Ethernet for the router and Ethernet for the switch. The first router provides WiFi connectivity for the Comcast security system and nothing else. Breaking the chain and connecting any of the routers or switch to the cable modem results in the light going red. Connecting a computer directly to the Ethernet port on the cable modem results in a green light and communications.
Removing the CM1000 and replacing it with the old Motorola cable modem results in communications for all devices tried so far.
This help?
> [...] Router (provided by Comcast)
Not a very detailed description of anything.
> [...] Router (provided by me)
Not a very detailed description of anything.
> [...] Breaking the chain and connecting any of the routers or switch
> to the cable modem results in the light going red.
With my weak psychic powers, I don't know how any of these routers is
configured, and exactly what you're connecting to what remains a
mystery. According to the CM1000 User Manual, the "Ethernet LED" should
be green, amber, or off; "red" seems not to be an expected outcome.
> Removing the CM1000 and replacing it with the old Motorola cable modem
> results in communications for all devices tried so far.
Would it really hurt too much to provide an actual model number for
any of these devices?
> Any "a single computer", or one specific "a single computer"?
>
> https://community.netgear.com/t5/x/x/m-p/1574972
Still wondering.
> This help?
Not really. Too many questions remain unanswered.Cable modem - Netgear CM1000 (DOCSIS 3.1)
Motorola cable modem - SB6121 (DOCSIS 3.0)
Comcast router (WiFi connectivity for security system) - Netgear WNR1000
General WiFi and Ethernet router - Linksys E2500
Gigabit Ethernet Switch - Netgear GS608
Only the Netgear GS608 has 1000BaseT ability. The other two max out at 100BaseT. That should be downward compatible with the CM1000's 1000BaseT capability.
Rather than saying there's not enough information, ask what you specifically need and I'll go from there.