Cable Router User's Guide

Appendix C Common Services
P-2900-4HB User’s Guide
116
Table 24 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.
IPSEC_TUNNEL(ESP:0) The IPSEC ESP (Encapsulation Security Protocol) tunneling
protocol uses this service.
IRC(TCP/UDP:6667) This is another popular Internet chat program.
MSN Messenger(TCP:1863) Microsoft Networks’ messenger service uses this protocol.
MULTICAST(IGMP:0) Internet Group Multicast Protocol is used when sending
packets to a specific group of hosts.
NEW-ICQ(TCP:5190) An Internet chat program.
NEWS(TCP:144) A protocol for news groups.
NFS(UDP:2049) Network File System - NFS is a client/server distributed file
service that provides transparent file sharing for network
environments.
NNTP(TCP:119) Network News Transport Protocol is the delivery mechanism
for the USENET newsgroup service.
PING(ICMP:0) Packet INternet Groper is a protocol that sends out ICMP
echo requests to test whether or not a remote host is
reachable.
POP3(TCP:110) Post Office Protocol version 3 lets a client computer get e-
mail from a POP3 server through a temporary connection
(TCP/IP or other).