Port forwarding is a name given to the combined technique of translating the address and/or port number of a packet to a new destination. Port forwarding allows remote computers (for example, computers on the Internet) to connect to a specific computer or service within a private local-area network (LAN). It allows external devices to pass through your router's firewall for services such as a web server, FTP server, gaming or any other designated applications. This utility in general governs the flow of electronic signals to stick to the path of a specified port into your computer.
Port forwarding can be divided into the following types:
1) Local port forwarding
2) Remote port forwarding
3) Dynamic port forwarding
To get more information try to download Nsauditor Network Security Auditor. This program has a utility: “Tcp Port Redirector”. It is a useful tool to forward TCP traffic from one port on the same or another machine to another. This tool is used for testing some services, firewall and intrusion detection systems. It can also be used for debugging programs and configuring other network tools. The part of port forwarding settings contains IP address and port to forward the TCP traffic. For more information please visit its main page Here.