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AJGCOLO's avatar
AJGCOLO
Aspirant
May 03, 2021

Modem wont send Internet to router

Have a CM1200 cable modem hooked to an Asus RT-N66R router. Have had this set up for some time. The other day the internet stopped working. Went through reseting both modem and router with no success. Called Comcast and they came out, replaced some outside wiring. They tested the speed from the back of the router and were getting the paid download speed. My connection was still not working and the tech told me that I probably needed a new router. The router, when powered on sends out a wireless signal and the lights read the connections in the ports. No internet is detected though on the router. Bought a new router Nighthawk AC2600, hoping this would solve the issue, but alas same issue. If I run a cat 6 directily from the modem to my desktop, it has internet. But if I run the same cable to either router, no internet. Again, I have reset and powered on and powered off the devices. I have tried numerous cat 6 cables, some older, some brand new, and none of these things have worked. I am at a standstill, please help? 

3 Replies

  • plemans's avatar
    plemans
    Guru - Experienced User
    May 03, 2021

    The CM1200 has 4x ethernet ports. 

    But through comcast, they only allow 1 device to be connected to it. 

    Both comcast and xfinity do a poor job of explaining the purpose of the 4x ports on the cm1200 (for business class setups or for the rare isp that supports mulitple public ip addresses)

     

    so if you have more than 1 device connection try this. 

    disconnect all devices from cm1200. 

    power off the cm1200 and the router. 

    power the cm1200 back on and give it a couple minutes. 

    attach the router to port 1 on the cm1200 and boot up the router. 

    give it a couple minutes and then try setup. 

     

    Make sure to only have 1 device connected to the cm1200. 

    • AJGCOLO's avatar
      AJGCOLO
      Aspirant
      May 03, 2021
      I learned this when on first got the modem, as no one explained it to me at that time. When testing I only would have the router plugged in and into port 1. Any other ideas?
      • plemans's avatar
        plemans
        Guru - Experienced User
        May 03, 2021

        Try this. Factory reset both the modem and the router. Push and hold reset for 7-15 seconds while they're powered on. 

        then disconnect the coax from the cm1200 and disconnect everything from the router and the modem. 

        then leave them for 2 minutes. 

        Connect coax back to the cm1200

        power it on and wait 2 minutes

        connect a new ethernet (cat 5e or greater) to the router's wan port. 

        Then turn the router on. give it a couple minutes and then attempt setup.