Appendix B Common Services

Table 87 Commonly Used Services

NAME

PROTOCOL

PORT(S)

DESCRIPTION

 

 

 

 

AH

User-Defined

51

The IPSEC AH (Authentication Header)

(IPSEC_TUNNEL)

 

 

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

 

UDP

24032

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

User-Defined

50

The IPSEC ESP (Encapsulation

(IPSEC_TUNNEL)

 

 

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

 

TCP

21

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.

 

 

 

 

HTTPS

TCP

443

HTTPS is a secured http session often

 

 

 

used in e-commerce.

 

 

 

 

ICMP

User-Defined

1

Internet Control Message Protocol is

 

 

 

often used for diagnostic or routing

 

 

 

purposes.

 

 

 

 

ICQ

UDP

4000

This is a popular Internet chat

 

 

 

program.

 

 

 

 

IGMP

User-Defined

2

Internet Group Multicast Protocol is

(MULTICAST)

 

 

used when sending packets to a

 

 

 

specific group of hosts.

 

 

 

 

IKE

UDP

500

The Internet Key Exchange algorithm

 

 

 

is used for key distribution and

 

 

 

management.

 

 

 

 

IRC

TCP/UDP

6667

This is another popular Internet chat

 

 

 

program.

 

 

 

 

MSN Messenger

TCP

1863

Microsoft Networks’ messenger

 

 

 

service uses this protocol.

 

 

 

 

222

MES-2110 User’s Guide

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ZyXEL Communications MES-2110 manual 222, Commonly Used Services, Name Protocol Ports Description