NAT STATIC PORT-BASED ENTRIES

The Static Port-based Entries of Network Address Translator (NAT) allows the users to define Virtual Servers in the Private Network based on the TCP/UDP port. Due to the nature of NAT, the computers in the Private Network cannot not be reached from the Internet. To support Internet servers such as Web Server or FTP Server, the router requires certain intelligence to redirect the Internet request to a computer in the Private Network.

For example, suppose that you have a Web Server with an IP address of 192.168.168.100. And your broadband ISP has assigned a Public IP address of 203.120.12.100 to the router. To support a Web Server in your Private Network, you need to define an NAT Static Port-based Entry to forward TCP port 80 (used by HTTP) to 192.168.168.100. Every http://203.120.12.100 requests will then be forwarded to the Web Server.

There are two sections in this configuration screen, Known Server and Custom Server:

Known Server supports a pre-defined list of common Internet applications for fast and easy implementation without needing to know which TCP/UDP port a specific Internet application is using.
Private IP Address Enter the Private IP address of the Virtual Server
Server Type Select from the pre-defined list of Internet servers.
Press the Add button to create this Virtual Server.

Custom Server enables implementation of Virtual Server for uncommon Internet applications.
Private IP Address Enter the Private IP address of the Virtual Server.
Protocol Enter the protocol used by the applications (TCP or UDP).
Ports Enter the range of the TCP/UDP ports used by this Virtual Server.
Server Type Enter a preferred name for this Virtual Server.

Press the Add button to create this Virtual Server.