Duplicate Internet channel on a laptop via a USB flash drive?

Question

MODX

The apartment has a wi-fi router, but the provider is not happy with the reliability, and from time to time the Internet can disappear for 5 minutes or a couple of hours.
To work, you need a stable Internet, so I'm thinking about a backup channel. I look towards the USB modem. Moreover, it is desirable that at the moment when the "main" Internet disappears, the USB modem itself starts working.
In this connection, the question is - is it possible to keep the modem constantly plugged into the laptop (during operation) and be simultaneously connected to two networks? When wi-fi is working, then all traffic goes through it, and when wi-fi disappears, then traffic goes through the modem.
If this is not set up automatically, then how best to organize everything?

Answer 1

Start with the rights if you put on your server.

Answer 2

You can keep both connections constantly connected, you don’t need to configure anything additionally (well, except maybe set wifi as a priority so that the Internet goes through it first)

Answer 3

Insert the flash drive into the router. Set up a backup route for it. Now that the primary route is unavailable, the packet will go through the backup.