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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 142 Commonly Used Services

NAME

PROTOCOLPORT(S)

DESCRIPTION

AH (IPSEC_TUNNEL)

User-Defined

51

The IPSEC AH (Authentication Header)

 

 

 

tunneling protocol uses this service.

 

 

 

 

AIM/New-ICQ

TCP

5190

AOL’s 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

7648

A popular videoconferencing solution from

 

UDP

24032

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

20

File Transfer Program, a program to enable fast

 

TCP

21

transfer of files, including large files that may

 

not be possible by e-mail.

 

 

 

 

 

 

 

H.323

TCP

1720

NetMeeting uses this protocol.

 

 

 

 

 

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MES3500-24/24F User’s Guide