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Asked: 2026-06-09T13:25:35+00:00

I have spent some time learning about socket programming in Java and have managed

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I have spent some time learning about socket programming in Java and have managed to make a couple of simple apps that utilize sockets. (instant messenger, tic-tac-toe, basic things) For my programs I used a client-server relationship with ServerSocket and Socket classes. So far I have been testing all my games on the same machine, meaning the client and the server both run on the same machine and the socket ip I am using is 127.0.0.1. Now I want to make a LAN game using the same logic. One computer will be the server and another will be the client.

The thing I wanted to ask, and pardon me if this is a stupid question, I am not really educated about networks and whatnot, but under what conditions can I establish a socket connection between two machines. What I mean is, I run my socket server on one computer and I want the socket on another computer to connect using the first computer’s ip. Say, for example my ip is “192.1.1.4” I want to be able to connect to that computer. Is it possible to establish a connection like this between just any two computers in the world? I know “lan” stands for “local area network” but I am quite ignorant on it beyond that. Sorry it it is a dumb question and I can clarify it if someone needs me to.

Basically, what criteria must be met on two machines for me to be able to establish a socket connection between them using a Java program?

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1 Answer

  1. Editorial Team

    You can make a TCP/IP connection between:

    • Two machines in the same LAN (private IP)
    • Two machines with public IP (internet)
    • A machine in a LAN and a machine with public IP provided that the connection is openned from the LAN to the public IP

    You can’t open a direct TCP/IP connection to a machine inside a LAN from outside the LAN, unless the gateway is configured to redirect the connections to a specific port to that machine.

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