How to Port Forward for Minecraft
In the "Minecraft" game, players are placed in an open-world environment where they can explore, mine, farm and construct to their hearts' content. "Minecraft" can be played in single-player or multiplayer mode. When playing the multiplayer mode, it is a good idea to forward the port the "Minecraft" server uses, which is port 25565. This will make sure all of the necessary Internet traffic will be sent directly to and from your computer.
Log in to your router's configuration menu, and click on the "Port Forwarding" link in the "Advanced" section of the navigation pane.
Select the "Port Forwarding" option, and then click on the "Add Custom Service," or similarly named, button below.
Type "Minecraft" in the "Service Name" field, select "TCP/UDP" from the "Protocol" drop-down menu, type "25565" in the "Starting Port" and "Ending Port" fields, and then type your computer's IP address in the "Server IP Address" field.
Click "Apply" and log out of your router's configuration menu. The "Minecraft" port has now been forwarded and you are ready to play the multiplayer mode.