Netgear WNDR3300 wireless router not working with your cable modem? Here’s how to fix it

Recently I set up a Netgear WNDR3300 wireless router with a Thomson (since renamed to Technicolor) DHG574 DOCSIS 3.0 cable modem on Mediacom. The router had worked perfectly with a previous CenturyLink DSL modem, but was now unable to maintain an internet connection. The Internet LED (the middle one in the above picture) would turn green initially, only to get stuck on amber soon thereafter.

Following the official instructions here only resulted in the same. For some reason, the router acquires a connection upon detection of Dynamic IP, but then loses it in the next step. To fix that, you’ll need to exit the Setup Wizard before it’s complete to prevent the router from borking the connection it detected:

  1. Connect to the router directly using a physical Ethernet cable.
  2. Power cycle the cable modem.
  3. Repeat Steps 1 – 5 only in the above link so that the router indicates that is has a Dynamic IP connection.
  4. Check to see that the Internet LED is green. If it is, proceed to the step 4 below.
  5. Click Basic Settings under Setup in the router admin UI.

    I suspect clicking any sidebar link that takes you out of the Setup Wizard works, but Basic Settings is pretty safe so I'm going with that.
    I suspect clicking any sidebar link that takes you out of the Setup Wizard works, but Basic Settings is pretty safe so I’m going with that.
  6. Exit the router admin UI.

You should now have a stable internet connection with the internet LED remaining green throughout. Unfortunately, all indications are that you’ll have to repeat this process after every power loss to the router and/or connection loss by the modem itself. It’s probably a good idea to get a new router anyway, but if it’s what you have to work with, this will certainly help.

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Author: jdrch

ISTJ, Rice Owl, UF Gator, mechanical engineer. STEM, sports, music, movies, humor. Account mine only & unaffiliated.

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