I use OpenWRT 21.02.0rc3 on Raspi 4 and several Unifi APs: a few U6 and a few old UAPs, all with factory firmware. Yesterday I had to set up a wifi repeater, TL-WA855RE (factory firmware), coupled with one of the UAPs. I set static lease for the repeater on OpenWRT with 192.168.1.18. Now, the repeater repeats the SSID from 192.168.2.0/24 for guests. Then, it turned out that it's getting IP address 192.168.2.159, not the static one I set on the router. For the GUI access, when I'm on 192.168.1.x/24, I can open the login page, but it doesn't let me login: no error message or anything, it just doesn't go to the next page when I enter the password and click "login". Forwarding from 1.x/24 to 2.x/24 is "Accept", so there is nothing blocking it in terms of firewall. (that's why I do get to the login page in the first place.) I tried to see what would happen if I set the static lease with 192.168.2.18, but it didn't work either: it's still getting 192.168.2.159 (after 12h, when the lease should be renewed). When I connect my PC to the extender, then I can login to the GUI of it under 192.168.2.159.
Internet usage over the extender is working fine, though. But I'm just wondering about access to GUI of the extender. I would appreciate any hint/explanation !