Netopia 430 S/T, Reference Manual

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