Nighthawk X10 AD7200 LAN Ports Not Working

Kitsap
Master
Aug 16, 2023
Normally the Xfinity gateways are a combination modem/router. When your Xfinity gateway was replaced, was the new device configured in bridge mode? This is usually done to support a downstream router like your R9000.

What is the model number of your new Xfinity gateway?
- trynkeepup
  Aspirant
  Aug 16, 2023
  Arris TG3482G
  - FURRYe38
    Guru - Experienced User
    Aug 16, 2023
    Thats a gateway router.
    
    Your ISP Modem already has a built in router and wifi. This would be a double NAT (two router) condition which isn't recommended. This would be a double NAT condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
    https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT
    Couple of options,
    1. Configure the modem for transparent bridge or modem only mode. Then use the NG router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
    2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the NG router gets from the modem. https://kb.netgear.com/25891/DMZ-on-NETGEAR-routers
    https://kb.netgear.com/24086/How-do-I-set-up-a-default-DMZ-server-on-my-Nighthawk-router
    3. Or disable all wifi radios on the modem and connect the NG router to the modem, LAN to LAN configure AP mode on the NG router.
    https://kb.netgear.com/20927/How-do-I-change-my-NETGEAR-router-to-AP-mode

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Nighthawk X10 AD7200 LAN Ports Not Working