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The WAN port connectivity stopped working
For the first time in the history of me using the Nighthawk X4S R7800 router, I used the Automatic update feature (usually I manually update it and install it after checking the hash). However, afte...
3. Powered off the device for 2 minutes and turned it back on. No change in results, so went back to v1.0.2.90 (manual install). Went to factory reset, but then realized the connection showed "good" on the Internet. The only change made before the upgrade back to v1.0.2.90 was updating the NTP server to a known good server (I noticed the time was off by 6 months anyway for some reason). The possibility is that NTP updated the time and then the FiOS router allowed the connectivity (or the Nighthawk did--still not sure which).
I needed to research the "[DoS Attack: IP Spoofing] from source:" issue because I started getting a flood of those error messages in my logs from two client devices, however many posts state to not worry about them (possible false positives). Those two devices may be IoT devices, which is harder to troubleshoot since connectivity back to them is not usual.
It's hard to say what fixed the issue, but if you run through the same steps I did, you may get it back to good without factory reset.
Rob Low
What brand and model is the FIOS router?
If your ISP MODEM/ONT has a built in router, 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/24104/How-do-I-change-my-Nighthawk-router-to-AP-mode-after-I-ve-already-run-setup
Try option #2 first....
I've not see any WAN side problems on my R7800 with v.90 FW loaded.