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2. Next to the name of the application, enter the number or range of the exter-
nal port(s) used by the server or Internet application in the Ext. Port col-
umn. Check with the Internet application software documentation for more
information.
3. On the same line, select UDP or TCP, or select both protocols.
4. Enter the IP address of the server that you want the Internet users to be able
to access. For information about finding the IP address, go to "Appendix F:
Finding the MAC Address and IP Address for Your Ethernet Adapter."
5. Check the Enable box to enable the services you have defined. Port Range
Forwarding will not function if the Enable button is left unchecked. This is
disabled (unchecked) by default.
6. Configure as many entries as needed—the Router supports up to 10 ranges
of ports. Click the Apply button when you are done.
UPnP Forwarding
The UPnP Forwarding screen, shown in Figure 6-21, displays preset applica-
tion settings as well as options for customization of port services for other
applications. This screen can be accessed by clicking the UPnP Forwarding
button on the Port Range Forwarding Tab.
The Preset Applications at the top of the list are among the most widely used
Internet applications. They include the following:
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, web developers typically upload the files to
the web server using FTP. FTP includes functions to log onto the network, list
directories, and copy files. FTP operations can be performed by typing com-
mands at a command prompt or via an FTP utility running under a graphical
interface such as Windows. FTP transfers can also be initiated from within a
web browser by entering the URL preceded by ftp://.
Telnet A terminal emulation protocol commonly used on Internet and TCP/IP-
based networks. It allows a user at a terminal or computer to log onto a remote
device and run a program.
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Instant Broadband
Series
®
EtherFast
Cable/DSL Router with QoS and 8-Port Switch
®
Figure 6-21
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 mes-
sage transfer agent (MTA), which stores and forwards the mail.
DNS (Domain Name System) The way that Internet domain names are locat-
ed and translated into IP addresses. A domain name is a meaningful and easy-
to-remember "handle" for an Internet address.
TFTP (Trivial File Transfer Protocol) A version of the TCP/IP FTP protocol
that has no directory or password capability.
finger A UNIX command widely used on the Internet to find out information
about a particular user, such as his or her 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, for example, name@universityname.edu.
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