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4-4 Reference Guide
Associating port numbers with nodes
When an IP client, such as a Netscape or Microsoft Internet Explorer
web browser, wants to establish a session with an IP server, such
as a web server, the client must know the IP address to use and the
IP port where the traffic is to be directed.
Just as an IP address specifies a particular computer on a network,
ports are addresses that specify a particular service in a computer.
There are many universally agreed-upon ports assigned to various
services. For example:
■ Web servers use port number 80.
■ FTP servers use port number 21.
■ Telnet uses port number 23.
■ SNMP uses port number 161.
The Netopia Router lets you associate these and other port
numbers with nodes on your internal LAN. See page 4-8 for details
on how to accomplish this.