ZyXEL Communications 1000 User Manual

ZyWALL USG 1000 User’s Guide

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 293   Commonly Used Services

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

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.