2 ISP how to walk on each?

Question

Telecommunications

There is such a scheme

By default, it works as a reserve: if the main one (ISP1) is cut off, we let the backup network (ISP2) into the network
How to start up one host from the local network (for example 192.168.0.7) via a backup channel? Is it possible to register static routes on the host? Or it is necessary to register a route on the gateway (what)?

Answer 1

or is it
habrahabr.ru/post/244385
www.technotrade.com.ua/Articles/mikrotik_2isp_setu...
or if Linux is just a forward of all packages, with a source like this (0.7) to a destination like this