Two wifi networks in one house

[Jflow]

I have an ATT 5286AC Router/Modem.  Can I set up the Orbi RBR750 and a completely new second Wifi network along side the ATT Wifi network?

[plemans]

You can. 

A couple things though. 

1. make sure you either put the netgears IP address into the ATT's DMZ or put the netgear into access point mode. that'll prevent a double nat

2. Make sure to seperate the wireless channels to prevent interference. 

[antinode]

> [...] Can I set up the Orbi RBR750 and a completely new second Wifi
> network along side the ATT Wifi network?

   Why?  Is there some actual problem which you are trying to solve?

   Are you looking for broader wireless coverage, or some kind of
separation between your two "Wifi networks", or what?

   Do you want client devices on one "Wifi network" to be able to
communicate with client devices on the other "Wifi network"?

> [...] or put the netgear into access point mode. [...]

   That should give you one extended LAN where every device could
communicate with any other.  But it would disable any fancy router
functions on the RBR750.

      https://kb.netgear.com/26765

[michaelkenward]

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@Jflow wrote:

I have an ATT 5286AC Router/Modem.  Can I set up the Orbi RBR750 and a completely new second Wifi network along side the ATT Wifi network?

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You really want to grapple with these issue?

What is Double NAT? | Answer | NETGEAR Support

How to fix issues with Double NAT | Answer | NETGEAR Support

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