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Chapter 9
68 Avaya C460 SMON User Guide
TCP/UDP Port Numbers
TCP/UDP port numbers are included in packets sent over a network using
either the TCP or the UDP transport layer protocol. The TCP/UDP port
number indicates how to apply an application layer protocol to the data at
the receiving end. For example, port 25 is associated with the SMTP
application protocol, and port 23 is associated with the Telnet application
protocol. A single application may use several different TCP/UDP port
numbers for various kinds of communication functions it performs.
There are three ranges of TCP/UDP port numbers:
• TCP/UDP ports 0 - 1023 - Well Known Port Numbers. Well
Known Port Numbers represent basic network services that are
widely available using standard TCP/UDP port numbers. Well
Known Port Numbers are assigned by the IANA (Internet Assigned
Numbers Authority). On many platforms, the ways in which these
TCP/UDP ports can be used are restricted by the system.
• TCP/UDP ports 1024 - 49151 - Registered Port Numbers.
Registered Port Numbers represent specific network services that
have been registered by the IANA at the request of a vendor or
organization.
• TCP/UDP ports 49152 - 65535 - Private Port Numbers. Private
Port Numbers are available for unrestricted use by applications.
The same Private Port Number might be used for different
purposes by different applications.
SNMP over UDP/IP SNMP packets travelling through the device.
SNMPtrap over UDP/IP SNMP trap packets travelling through the device.
Table 9-2. User Protocols (Continued)
Protocol Description