Two routers, two providers - one Internet. Maybe?

Question

Computer networks

Greetings!
There are two providers. Provider 1 and Provider 2. Each 50 Mbps.
Also, there are two routers.
How to combine them into one Internet source, summing up the speed?

Answer 1

you need a router with a balancer or two cards, then put the balancer as software.

Answer 2

In theory, you can, you just need an external server (somewhere on the hosting) with a channel of at least 100Mbps. Build two tunnels before it through both providers, and wrap traffic either into one tunnel or the other based on the SRC / DST hash, and the external server will act as a gateway to the Internet.