Set the Wi-Fi interface settings on both 2.4Ghz and 5Ghz to Disabled
Click the Save button towards the bottom of the page
This way, you're only using the SSID from the Sonic Wall for Wi-Fi. Once you do that, you must configure IP passthough on the AT&T gateway so that your Sonic Wall handles all the LAN traffic instead. Check out this support post we wrote for instructions on setting up IP Passthrough.
That was quite a bit of information, so let us know if you run into any issues along the way!
Rury, AT&T Community Specialist
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