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Appendix D Services
VMG5313-B10A/-B30A Series User’s Guide
384
Table 156 Examples of Services
NAME PROTOCOL PORT(S) DESCRIPTION
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 (for instance 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 Protocol, 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 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.
IMAP4 TCP 143 The Internet Message Access Protocol is used for e-
mail.
IMAP4S TCP 993 This is a more secure version of IMAP4 that runs
over SSL.
IRC TCP/UDP 6667 This is another popular Internet chat program.
MSN Messenger TCP 1863 Microsoft Networks’ messenger service uses this
protocol.
NetBIOS TCP/UDP
TCP/UDP
TCP/UDP
TCP/UDP
137
138
139
445
The Network Basic Input/Output System is used for
communication between computers in a LAN.
NEW-ICQ TCP 5190 An Internet chat program.
NEWS TCP 144 A protocol for news groups.