Instead you want to router to forward that packet to the computer running the server. (Remember, a port is just a number from 0 - 65,535.) When that request reaches your router, you don't want the router to just drop the packet (for a change). When an Unreal Tournament 2004 client running on one of friend's computers wants to join your server, it will originate the request with a destination IP address being the public address of your router and also to particular port. See Want to Host an Internet Game Server? Check First.) For example, you might want to run an Unreal Tournament 2004 server so you and some of your friends can have fun chatting to each other over the Internet and killing each other. (You should make sure that you have the right to run a server before doing so. The common use of this is when you want to temporarily or permanently provide a server for a game using one of computers on your LAN as the server host. Sometimes, however, you may want machines on the Internet to be able to initiate a request on a certain port or set of ports that one of the devices on your LAN will serve. In the router's default configuration, no device on the Internet can initiate a request destined for your router or a device on your LAN devices on the Internet can only send back responses to requests made from the router or devices on your LAN (e.g., browsing a web site). If so, they could easily see your published/shared files using a Microsoft file sharing query, for example. Normally those requests are from a hacker trying to see if your computer has no firewall in front of it. ![]() Therefore, it just throws the request (packet) away. This section could also be titled, "How to open yourself up to attack in a civil sort of way." Normally, if your router receives a request from the Internet, your router will not have a matching request from a device on your home LAN. ![]() Port Forwarding and Adding Firewall Rules
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