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NBG5615 User’s Guide 249
APPENDIX C
Common Services
The following table lists some commonly-used services and their associated protocols and port
numbers. For a comprehensive list of port numbers, ICMP type/code numbers and services, visit
the IANA (Internet Assigned Number Authority) web site.
Name: This is a short, descriptive name for the service. You can use this one or create a
different one, if you like.
Protocol: This is the type of IP protocol used by the service. If this is TCP/UDP, then the service
uses the same port number with TCP and UDP. If this is USER-DEFINED, the Port(s) is the IP
protocol number, not the port number.
Port(s): This value depends on the Protocol. Please refer to RFC 1700 for further information
about port numbers.
•If the Protocol is TCP, UDP, or TCP/UDP, this is the IP port number.
•If the Protocol is USER, this is the IP protocol number.
Description: This is a brief explanation of the applications that use this service or the situations
in which this service is used.
Table 84 Commonly Used Services
NAME PROTOCOL PORT(S) DESCRIPTION
AH
(IPSEC_TUNNEL)
User-Defined 51 The IPSEC AH (Authentication Header)
tunneling protocol uses this service.
AIM/New-ICQ TCP 5190 AOLs Internet Messenger service. It is
also used as a listening port by ICQ.
AUTH TCP 113 Authentication protocol used by some
servers.
BGP TCP 179 Border Gateway Protocol.
BOOTP_CLIENT UDP 68 DHCP Client.
BOOTP_SERVER UDP 67 DHCP Server.
CU-SEEME TCP
UDP
7648
24032
A popular videoconferencing solution from
White Pines Software.
DNS TCP/UDP 53 Domain Name Server, a service that
matches web names (for example
www.zyxel.com
) to IP numbers.
ESP
(IPSEC_TUNNEL)
User-Defined 50 The IPSEC ESP (Encapsulation Security
Protocol) tunneling protocol uses this
service.
FINGER TCP 79 Finger is a UNIX or Internet related
command that can be used to find out if a
user is logged on.
FTP TCP
TCP
20
21
File Transfer Program, a program to enable
fast transfer of files, including large files
that may not be possible by e-mail.
H.323 TCP 1720 NetMeeting uses this protocol.
249


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