Using a VNC port other than 5900

Apple has a VNC server that only allows access to port 5900. There is no way to change it, so the client has to be set up to be routed to that port. I needed 2 ports, since my Mac has two internal ip addresses — one for ethernet and one for wi-fi — and there is no way to forward an outside request to your home router for the the same port to two different ip addresses. A second port is necessary. In order to set that up, you need to download a 3rd party VNC software, that will handle requests on other ports like 5901. Vine Server is one of those.

This way you can pick to remotely connect to your Mac through either your home networks's wi-fi or ethernet.

Same would apply if you need to access more than one computer on your network from outside.