Minecraft wiki entry for Setting_up_a_server, associated text: Once you have managed to locate your router's admin page, and find the Port Forwarding page; hit add new service (may not work) (if you use Belkin, this can be very difficult to perform) or custom service. When you get a page asking to setup the new rule, it should prompt you on what you want to call it. You may name it as you wish, but for simplicity, name it "minecraft". Then, you want to look for "type". If "TCP/UDP" or "Both" isn't an option you will have to create two rules for both protocols. For the ports (internal and external), enter 25565. If it asks for anything else other than output IP (or internal IP, server IP), leave it alone and continue.