How to connect OpenWRT via Wi-Fi to the internal network of an upstream router?

Question

WiFi

The situation is as follows:
- there is a router ("Main") that distributes wifi with the Internet, a wifi network: 192.168.1.*
- there is a router ("Second") with OpenWRT firmware, connected (as a client) to the wifi network of the Main router, also to this (Second) router is connected by an ethernet cable to a computer, network: 192.168.0.*;
How to make the computer behind the second router work in the local network of the first router?
PS The text is partially communized on another user's toaster, but it accurately describes the problem. The user question remains unresolved.

Answer 1

The first thing that comes to mind. If the address spaces aren't nailed down for some reason, it's easier to keep the entire household on the same subnet. In this case, I would set the "Second" router to bridge mode, and the computer connected to it would enter the 192.168.1.0/24 subnet either statically or dynamically.
The second is if the grids cannot be changed. Register static routes on both routers. On the "First" to the subnet 192.168.0.0/24 and on the "Second" to the subnet 192.168.1.0/24