Port range forwarding sets up public services on your network, such as web servers, ftp servers, e-mail servers, and other specialized Internet applications. When you have set up one service, then the communication requests from the Internet to your router’s WAN port will be converted to the specified LAN IP address. : DNS(53) FTP(21) GOPHER(70) HTTP(80) NNTP(119) POP3(110) PPTP(1723) SMTP(25) SOCK(1080) TELNET(23)  ID 1 2 3 4 5 6 7 8 9 10

Help information     Start port- End port:WAN service port.     Enable:select to bring the settings into effect.     Delete:It helps you to clear the settings,click Save to make it effective.     Add to :It helps you to add the well-known service port to the start port field of the item you are setting.