ZyXEL Communications ES-100, User Manual

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Appendix B Common Services
MES-2110 User’s Guide
222
Table 87 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 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.
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.
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
(MULTICAST) User-Defined 2 Internet Group Multicast Protocol is
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.