I have a 2009-era Airport Extreme that used to provide routing and WiFi for our cablemodem. Time Warner updated our cablemodem to a DG860, which comes with its own built-in WiFi.
I'd like to re-purpose the Airport Extreme as a WiFi bridge. Specifically, I'd like to be able to plug my wired ethernet devices (e.g. a printer in the basement) into a LAN port on the Airport Extreme, and have it bridge to the Time Warner WiFi network.
When I attempt this in Airport Utility the most logical option seems to be "Add to an existing network", but it seems to expect to be physically plugged into the network. I.e. it wants to be plugged into the other router:
Is there a way to bridge the Airport Extreme over WiFi?