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Forum Discussion

M79's avatar
M79
Aspirant
Jul 25, 2021

CM1200 modem not working with R7800 router

I just increased my internet speed to 800 so I got the CM1200 and my R7800 will not get an internet signal from it, the R7800 is the only thing plugged into the CM1200, it still works fine with other ...
plemans's avatar
plemans
Guru - Experienced User
Jul 25, 2021

Try this. 

1. disconnect everything from the cm1200 and the router. Even coax. Then power them both off. 

2. what 2 minutes.

3. connect coax back to the modem and power it on. wait 2 minutes

4. connect port 1 on cm1200 to wan port on router. 

5. power the router on and wait 2 mintues. 

 

see if it can be setup. 

Make sure nothing else gets plugged into the cm1200. It has more ports but most ISP's only allow 1 device to be connected to it. 

M79's avatar
M79
Aspirant
Jul 25, 2021
Thank you for the input, I tried exactly as you suggested but there is still no internet coming out of the router either wirelessly or wired.
  • plemans's avatar
    plemans
    Guru - Experienced User
    Jul 25, 2021

    Tried changing the cable? 

    Tried factory resetting the R7800?

    • M79's avatar
      M79
      Aspirant
      Jul 25, 2021
      Just tried both of those again and they made no difference.