How to setup R7000 (nighthawk AC1900) to work behind Arris BGW210-700?

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rodz704 wrote:

 

The AT&T gateway is a BGW210-700.

If that is this thing:

it is a modem/router. So you are trying to put one router behind another router.

Bad idea.

Two routers on your network can cause headaches. For example, you can end up with local address problems. Among other things, the other router can misdirect addresses that the Netgear router usually handles, such as routerlogin.net or the usual IP address for a router, 192.168.1.1.

This explains some of the other drawbacks.

What is Double NAT? | Answer | NETGEAR Support

Unless you have specific reasons for using two routers it is often easier to use just one router and then to set up the second router as a wifi access point. Netgear advises this, as does just about every site you will visit.

It may be possible to put the modem/router into modem only (bridge) mode and then to use the second device as the router. Sometimes it is easier to put the second router into AP mode. But that has its own drawbacks:

Disabled Features on the Router when set to AP Mode | Answer | NETGEAR Support

Those scary warnings are probably a red herring. Your "guardian" software isn't intelligent enough to recognise what is going on and doesn't like the way that Netgear connects to the R7000.