ZyXEL p-2602r-d1a Manual Do Utilizador

P-2602R/RL-DxA Series User’s Guide

Appendix E Services

293

The following table lists some commonly-used services and their associated protocols and port 
numbers.

• 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.

• 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 116   Examples of Services

AH 

(IPSEC_TUNNEL)

User-Defined

51

The IPSEC AH (Authentication Header) 

tunneling protocol uses this service.

AIM

TCP

5190

AOL’s Internet Messenger service.

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
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 (e.g. 

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.

HTTP

TCP

80

Hyper Text Transfer Protocol - a client/

server protocol for the world wide web.