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R8000 Nighthawk X6 AC3200 - upgraded to fiber and not seeing the expected speeds
Fiber became available in the neighborhood through AT&T and had it connected. The R8000 Nighthawk x6 ac3200 router was in place before the fiber was installed and had decent download rates (80Mbps). ...
You should enable IP Passthrough or DMZPlus on the AT&T gateway. Select your R8000 as the passthrough device. This will eliminate double NAT in your setup.
On your R8000, turn off Dynamic QoS as well as MAC address cloning. Then reboot the router. Then check speeds.
Frankly, it might be easier to reset the router to factory settings. Then just do basic config (change admin password, set up Wi-Fi and adjust LAN settings). Don't turn on any other features. Then check speeds.
I took your advice and just went back to factory settings. After the factory settings applied and basic config, I re-ran the speedtest. I am now receiving anywhere from 850-950 Mbps download and 650-750 upload.
Now, I then started to apply different settings to the router and continue testing to see if I could find a configuration contributing to the slowness. The first place it slowed down is when the Access Control was turned on. It was not blocking any devices to start with at all. The speedtest was less than half the speed. After turning the Access Control back off (router reboot, etc.), I ran another speed test. Back up to the 900+ Mbps range.
I would hope someone at Netgear could look into this. I would not expect this drastic a hit to the download performance with the Access Control turned on.
For now, the router is performing at an acceptable level.
Thank you all for the input
Unfortunately, MAC address filtering is one of those features that isn't supported with hardware acceleration. There's nothing Netgear can do. The Broadcom chipset doesn't support it.