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P-334U/P-335U User’s Guide
176 Chapter 15 Bandwidth Management
15.6.1 Services and Port Numbers
The commonly used services and port numbers are shown in the following table. Please refer
to RFC 1700 for further information about port numbers. Next to the name of the service, two
fields appear in brackets. The first field indicates the IP protocol type (TCP, UDP, or ICMP).
The second field indicates the IP port number that defines the service. (Note that there may be
more than one IP protocol type. For example, look at the DNS service.
(UDP/TCP:53) means
UDP port 53 and TCP port 53.
MSN Webcam MSN messenger allows you to chat online and send instant messages. If you use
MSN messenger and also have a webcam, you can send your image/photo in real-
time along with messages
WWW The World Wide Web (WWW) is an Internet system to distribute graphical, hyper-
linked information, based on Hyper Text Transfer Protocol (HTTP) - a client/server
protocol for the World Wide Web. The Web is not synonymous with the Internet;
rather, it is just one service on the Internet. Other services on the Internet include
Internet Relay Chat and Newsgroups. The Web is accessed through use of a
browser.
Table 63 Media Bandwidth Management Setup: Services (continued)
SERVICE DESCRIPTION
Table 64 Commonly Used Services
SERVICE DESCRIPTION
AIM/New-ICQ(TCP:5190) AOL’s Internet Messenger service, 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(UDP/TCP:53) Domain Name Server, a service that matches web names (e.g.
www.zyxel.com) to IP numbers.
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:20.21) 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.
ICQ(UDP:4000) This is a popular Internet chat program.
IKE(UDP:500) The Internet Key Exchange algorithm is used for key distribution and
management.
IPSEC_TUNNEL(AH:0) The IPSEC AH (Authentication Header) tunneling protocol uses this
service.