Citation :
Things to consider when using a router to connect to Battle.net on Warcraft III
If you are connecting to Battle.net through a router, you may need to set up port forwarding in order to join or host games correctly. Though we are not able to provide steps for setting up every router on the market, the information below is designed to better explain some common issues related to Battle.net and routers. It is not our intention to try and explain how to setup the network itself and it is assumed that the router has already been configured for normal use and is operational. Port Forwarding Explanation:
Port Forwarding allows incoming game data (packets) to be forwarded to the computer it is destined for. If forwarding is not used or available on the network, Battle.net will only "see" packets coming from a single IP address and send packets back to that one address. For example, if the default port of 6112 is used for all computers, the router will not know which computer should get the packets from Battle.net and hosting a game will be impossible. By having each computer communicate with a unique port number, Battle.net replies with that information in the packets and the router can easily make sure each computer receives its intended packets. Warcraft III Hosting Example:
If you have two computers on a network (using a router to connect to Battle.net), go to the Gameplay Options in Warcraft III on computer #1 and set the port to 6112 and on computer #2 set the port to 6113. Next, you would need to set up the router so computer #1's internal IP address is assigned to port 6112 and computer #2's internal IP address is assigned to port 6113. This will ensure that the game data is forwarded to the correct computer hosting the game.
Additional information and recommended network settings can be found on our Network Help page ( http://www.blizzard.com/support/?id=msi0423p ).
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