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Only 1 ethernet port (of 2) works on AC1200 Cable Modem Router (C6230)
Only 1 ethernet port (of 2) works on 16x4 DS3.0 AC1200 Cable Modem Router (C6230). Other port, and wifi, still work. How do I fix, or does that mean it's dying and needs to be replaced?
Do a back up configuration to file:
https://kb.netgear.com/24231/How-do-I-back-up-the-router-configuration-settings-on-my-Nighthawk-router
Then try a factory reset and setup from scratch to see if the ethernet ports return to working order. I'd do a full power OFF after pressing the reset button for 15 seconds then release, give 5 seconds after releasing the reset button and power OFF the unit. Give 10 seconds then power back ON.
Apply the saved configuration from file to bring back the system to existing configuration.
If that fails, and you only get one or two ethernet ports working you could install a external Non managed 1Gb LAN swithch 5-8 port unit and have additional ports that you need. NG GS105 or 108 series would work.
Otherwise, ya, could be the gateway is failing and needs to be replaced.