My main objective is to use is as a wifi repeater by exploiting its dual (2.4 Ghz + 5 Ghz) radio device.
I'd like to use the 5 Ghz channel to connect to my main Lede router and the 2.4 Ghz channel to connect the wifi clients to the network.
DHCP should be provided by my main router (another Lede box with dual wifi), thus no NAT should be involved in the solution.
I think I'd configure the 5 Ghz wifi as client to my main router, but don't know how to finish the setup.
As a final step, I'd like to also use the wired Ethernet to get access to the main router with its DHCP. But this step is not as important as the previous one.