To add a customized application in the UPnP Forwarding screen:
1. Enter the name of the application in the appropriate Customized
Applications field. Continue with the fields on the same line.
2. In the Ext. Port field, enter the number of the external port used by the
server.
3. Check Protocol TCP or Protocol UDP, depending on which protocol you
use.
4. Enter the number of the internal port.
5. Enter the IP address of the server that you want the Internet users to access.
Refer to your software documentation for more information about chang-
ing service port settings, if necessary.
6. Now, check the Enable box or the changes that you made to UPnP
Forwarding will not function.
Port Range Forwarding
Forwarding is generally used to set up a web server, ftp server, or e-mail serv-
er on your network. The router’s DHCP function must be disabled to use
Forwarding.
Click the View Port Range Forwarding button to open the Port Range
Forwarding screen. (See Figure 6-14.) Port forwarding sets up public services
on your network. When users from the Internet make certain requests of your
network, the router will forward those requests to the appropriate computer.
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• Telnet A terminal emulation protocol commonly used on the Internet and
TCP/IP-based networks. It allows a user at a terminal or computer to log on
to a remote device and run a program.
• 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.
• 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.
• TFTP (Trivial File Transfer Protocol) A version of the TCP/IP FTP proto-
col that has no directory or password capability.
• Finger A UNIX command widely used on the Internet to find out informa-
tion about a particular user, such as telephone number, whether currently
logged on or the last time logged on. The person being “fingered” must have
placed his or her profile on the system. Fingering requires entering the full
user@domain address.
• HTTP (HyperText Transport Protocol) The communications protocol used
to connect to servers on the World Wide Web. Its primary function is to
establish a connection with a Web server and transmit HTML pages to the
client browser.
• 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.
• NNTP (Network News Transfer Protocol) The protocol used to connect to
Usenet groups on the Internet. Usenet newsreaders support the NNTP pro-
tocol.
• SNMP (Simple Network Management Protocol) A widely used network
monitoring and control protocol. Data is passed from SNMP agents, which
are hardware and/or software processes reporting activity in each network
device (hub, router, bridge, etc.) to the workstation console used to oversee
the network. The agents return information contained in a MIB
(Management Information Base), which is a data structure that defines what
is obtainable from the device and what can be controlled (turned off, on,
etc.).
You must check the Enable box to enable the applications you have defined.
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