In a typical home networking setup, internet access is through a DSL or Cable modem. That modem may be connected to a router, which is then connected to the networked computers by Ethernet or WiFi. The router is the device that the Internet sees; it holds the public IP address. The computers behind the router, on the other hand, are invisible to the Internet as they hold a local IP address each. Port forwarding is necessary in the router because computers will send information directed to the public IP address and the router needs to know where to send that information.
Port forwarding allows remote computers (e.g. public machines on the net) to connect to a specific computer within a private LAN.
This link will take you to the config guide of your router... Yes, you will need to know the make and model number of your router first...
PortForward.com - Free Help Setting up Your Router or Firewall
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