Internet and LAN over different network connections in Mac OS X. How?

Question

macOS

A Mac OS X computer is connected to 2 networks at the same time: via cable and via Wi-Fi. The Internet is available from both networks (different providers), but it is necessary that the computer uses the Internet only from the network via Wi-Fi, and the network via cable would have normal access to network resources.
How to set it up?
Thank you.

Answer 1

I'll tell you how I decided. It's simple, the system itself does everything. It was necessary to make Wi-Fi connections a higher priority in the list of connections. And when it is connected, the Internet works through it. Network resources are available on both connections.

Answer 2

You can assign static routes to local resources. route -n add xxx xxx
And then, when you connect to WiFi, the Internet will work through WiFi, and local resources through LAN.

Answer 3

do not set the default gateway in the network card settings

Answer 4

Faced the same problem, a poppy in a corporate network from Windows machines with cable access, plus Wi-Fi Internet access. Wi-Fi network priority. Access by computer names on the local network without problems, it connects via IP only if you switch the network priority or turn off Wi-Fi.
I registered a static route sudo route -n add 10.4.0.4/24 10.5.0.254 , where 10.4.0.4 is the address of the desired machine, 10.5.0.254 is the corporate network gateway. Access granted, problem solved :)