Simulating LAN computers

How can I test a C# multiplayer(4 players) LAN game.Rather than connecting 4 computers can I simulate 4 different computers(run the application with different IPs. i.e four instances of the application).I considered to do with four virtual machines but can't run four virtual machines.(h/w resources :(

Solution

Why not run all instances on the same machine but just on different ports?

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