Linksys WTR54GS User Manual

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The Port Range Forwarding screen allows you to set up public services on your network, such as web servers, ftp 
servers, e-mail servers, or other specialized Internet applications. (Specialized Internet applications are any 
applications that use Internet access to perform functions such as videoconferencing or online gaming. Some 
Internet applications may not require any forwarding.)

Before using forwarding, you should assign static IP addresses to the designated PCs.

Port Range Forwarding

To forward a port, enter the information on each line for the criteria required. Descriptions of each criteria are 
described here.

Application Name. Each drop-down menu offers a choice of ten preset applications (select None if you do not 
want to use any of the preset applications). Select up to five preset applications. For custom applications, enter 
the name of your application in one of the available fields.

The preset applications are among the most widely used Internet applications. They include the following:

DNS (Domain Name System). The way that Internet domain names are located and translated into IP addresses. A 
domain name is a meaningful and easy-to-remember “handle” for an Internet address.

Finger. A UNIX command widely used on the Internet to find out information about a particular user, such as a 
telephone number, whether the user is currently logged on, and the last time the user was logged on. The person 
being “fingered” must have placed his or her profile on the system in order for the information to be available. 
Fingering requires entering the full user@domain address.

FTP (File Transfer Protocol). A protocol used to transfer files over a TCP/IP network (Internet, UNIX, etc.). For 
example, after developing the HTML pages for a website on a local machine, they are typically uploaded to the 
web server using FTP.

POP3 (Post Office Protocol 3). A standard mail server commonly used on the Internet. It provides a message store 
that holds incoming e-mail until users log on and download it. POP3 is a simple system with little selectivity. All 
pending messages and attachments are downloaded at the same time. POP3 uses the SMTP messaging protocol. 

SMTP (Simple Mail Transfer Protocol). The standard e-mail protocol on the Internet. It is a TCP/IP protocol that 
defines the message format and the message transfer agent (MTA), which stores and forwards the mail.