How to combine two Internet connections into a bridge, while maintaining the distribution and local area?

Question

Computer networks

Available: a router (Zyxel Keenetic 4G III), a slow but stable ethernet (white ip) connection and a smart, but not suitable 4G modem for all tasks. Is there a way to distribute only an ethernet connection from the router to machine 1, and "hang" the rest on a 4G modem, while maintaining access to the local area for everyone?

Answer 1

Set up (or flash) the modem into the "router" (if it is not already a router).
And so the task comes down to specifying different gateways on computers - on machine 1 it will be a router, on the rest - a moped (router).
And yes, what's with the bridge?

Answer 2

Zyxel has a Russian-speaking support - they always helped with answers help dog keenetic.net