How to connect a Teltonika RUT200 router to a Google Nest Pro router to give devices connected to it internet access?

I'm currently facing an issue with setting up my home network to provide internet access to devices connected via a Teltonika RUT200 router. My goal is to maintain two separate networks in my home: one served by a Google Nest Pro WiFi router and the other by the Teltonika RUT200. Despite the separation, I want devices connected to the Teltonika network to have internet access. Here are the details of my setup and what I have attempted so far: Current Setup: Primary Router: Google Nest Pro WiFi, connected directly to the ISP modem and functioning correctly with internet access. Secondary Router

Question by Pyy on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.