RBR750 Throttling WiFi to 100mbps on Gigabit Connection

One additional consideration is how important the Orbi "router features" are.  When the ISP installs a router instead of a simple modem or fiber Optical Network Terminator (ONT), this creates a situation known as a "Double NAT".  i.e. the ISP router uses the public IP address and creates a Local Area Network (LAN), hiding the local IP addresses from the internet using Network Address Translation (NAT).  The customer router does the same thing.  i.e. it accepts one private IP address from the ISP router and creates its own private address LAN, hiding those IP addresses with NAT.

This "Double NAT" can create all sorts of awkward situations, and can dramatically interfere with specific network applications.  (Internet search for "double NAT" will provide examples.)

The obvious way to deal with a Double NAT is to get rid of one of the routers. either

• Put the ISP device into "Bridge Mode" (sometimes called "Passthrough Mode"), thus giving up ALL of its router functions.
  This keeps the customer router as the primary routing device, creating one private LAN, assigning IP addresses, and preserving all of the "router functions" of the customer router.
  In the case of Orbi, that would include the options to enable Bitdefender Armor, Smart Parental Controls, etc.
• Keep the ISP device as the router and put the customer device into "Access Point" (AP) mode.  This leaves the ISP router in charge of "router stuff" (creating IP addresses, regulating network access, etc.) and leaves the customer router providing WiFi and network access.