How to use it in production?

[Arctomachine]

I understand general idea of this app - hold bad ssh connections. But how to make it work? What do I need to do in server to make it trap port 22 while I can connect to port 12345 freely? Or how do I need to connect to port 22 to make it let me in (how to show it is good connection)? Important: without making my computer the only one whitelisted