I'm a newbie OpenWrt user and have got a question concerning my configuration:
In the cellar of our house, we've got a Vodafone station which works as a cable modem/router. At the moment, it works in Bridge mode, i.e. only as a modem. One of the Vodafone station's LAN ports is connected to the WAN port of a FritzBox 4040 with OpenWrt 22.03 installed. One of the FritzBox' LAN ports is connected to a powerline adapter which feeds three dumb wireless APs in different parts of the house.
The setup works very well in most respects, apart from the speed: Due to the powerline, latency can be quite high, and download speed is < 50 Mbit/s (the cable connection has 250 Mbit/s download/50 Mbit/s upload, which I verified connecting via ethernet cable to the FritzBox). As an alternative, I activated the FritzBox' 5Ghz Wifi radio and connected it to a relay-wifi-bridge positioned in the basement. The bridge device offers 2,4Ghz Wifi and additionally connects to a powerline adapter (I removed the powerline adapter in the cellar first). This step has improved speed and reduced latency a bit.
As the bridge device is a GL-Inet AR750 router which only has 100 MBit LAN ports, I now thought of another alternative: I plan to put the Vodafone Station into router mode and activate its Wifi. I would like to position the FritzBox in the basement and use its 5GHz radio to connect to the Vodafone Station. That said, I don't want to use it as a repeater/relay bridge, but as a router (I installed Adblock and Stubby on my FritzBox). Is this setup possible? E.g. can I just scan for the Wifi of the Vodafone station on the Fritzbox to create a new WWAN interface? And how do I proceed from there?
Thanks for your help!