I'm not even sure such a thing exists but it feels as if it ought to.
I want a 'WiFi switch' that I can plug into an existing LAN such that it allows WiFi access on the *same* subnet. Thus it won't do anything clever like DHCP or DNS or anything as that will be done by existing devices on the LAN.
All the 'range extenders' I can find are WiFi both in and out and also tend to create their own subnet. Anyway I need something that hangs on a hard-wired ethernet connection.
Is there such a thing?