I just had ATT Fiber 1000 installed with a BGW210-700 Gateway from AT&T. I am running the Orbi as the Router behind it. I set up the Orbi as fixed allocation of 192.168.1.253 in the IP Allocation screen, left DHCP on, Turned off WiFi, DIsabled Packet Filtering, and turned on IP Passthrough with Allocation Mode: Passthrough + Passthrough Mode: DHCPS-fixed + selected the RBR50's mac address from the device list. I also set all the Firewall Advanced settings to OFF.

When I run a speed test on the BGW210-700, I get 976dl/903ul. I have the ORBI RBR50 connected via cable to the BGW210-700, and when I run a speedtest on the Orbi, I consistently get 475dl/902ul (half the download speed). And that's hardwired. Wifi (obviously) goes down from there.

Any suggestions of what to check or what could be cutting my DL speed in half? I use the Orbi as my router and run the DHCP server in the 10.0.0.x range, with the RBR50 itself as 10.0.0.1, and all others routing from .2 on. I have two satellites in other areas of the house, one backhauled via wire, and the other backhauled via WiFi.

Some of my settings:

Under Lan setup -> LAN TCP/IP Setup:
- RIP Direction = BOTH (default)
- RIP Version = Disabled (default)
Under WAN setup:
- I do have a default DMZ server set up for 10.0.0.200 which is the IP reservation for my Ring Doorbell camera
- Disable IGMP Proxying is checked (default)
- NAT Filtering = Open with Disable SIP ALG as unchecked
No port forwarding or triggering set
Dynamic DNS is unchecked
No static routes
UPNP is off
IPV6 -> Internet Connection type is Disabled (default)

Any ideas what to try?

(PS - Yes, I tried a new cable. No difference...)

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Orbi with ATT Fiber download speeds cut in half