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• 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, etc.) to the workstation console used to oversee the net-
work. 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.
To add a server using UPnP Forwarding:
1. Enter the name of the application in the appropriate Application Name
field.
2. Next to the name of the application, enter the number of the external port
used by the server in the Ext. Port column. Check with the Internet appli-
cation software documentation for more information.
3. On the same line, select the protocol UDP or TCP.
4. Enter the number of the internal port used by the server in the Int. Port col-
umn. Check with the Internet application software documentation for more
information.
5. Enter the IP address of the server that you want the Internet users to be able
to access. To find the IP address, go to Appendix D: Finding the MAC
Address and IP Address for Your Ethernet Adapter.
6. Check the Enable box to enable the services you have defined. UPnP
Forwarding will not function if the Enable button is left unchecked. This is
disabled (unchecked) by default.
The Preset Applications are among the most widely used Internet applications
that may require forwarding. 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, they are typically uploaded to the
web server using FTP. FTP includes functions to log onto the network, list
directories, and copy files. It can also convert between the ASCII and
EBCDIC character codes. 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.
• 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 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.
• 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 web browser.
Instant Wireless
®
Series
Wireless Access Point Router with 4-Port Switch
43 44