Server suddenly offline

[robinsee]

You said you don't have a repeated, but is your WiFi setup some sort of mesh network?

I recall another user with a similar issue that did have a mesh router setup.  There was some setting that pushed clients on one of the mesh nodes, vs the main node, to a different subnet.  Which would line up with the server having two IPs.

would this be called Double NAT?

i found a Reddit post on it. it sounds like this model has numerous issues and a bypass is the best solution

https://www.reddit.com/r/ATTFiber/commen...ouble_nat/