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Appendix C Common Services

Media Server User’s Guide

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 Management 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. 

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

User-Defined

1

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).

PPTP

TCP

1723

Point-to-Point Tunneling Protocol enables secure 
transfer of data over public networks. This is the 
control channel.

PPTP_TUNNEL 
(GRE)

User-Defined

47

PPTP (Point-to-Point Tunneling Protocol) enables 
secure transfer of data over public networks. This is 
the data channel.

RCMD

TCP

512

Remote Command Service.

REAL_AUDIO

TCP

7070

A streaming audio service that enables real time 
sound over the web.

REXEC

TCP

514

Remote Execution Daemon.

RLOGIN

TCP

513

Remote Login.

RTELNET

TCP

107

Remote Telnet.

RTSP

TCP/UDP

554

The Real Time Streaming (media control) Protocol 
(RTSP) is a remote control for multimedia on the 
Internet. 

SFTP

TCP

115

Simple File Transfer Protocol.

SMTP

TCP

25

Simple Mail Transfer Protocol is the message-
exchange standard for the Internet. SMTP enables you 
to move messages from one e-mail server to another.

SNMP

TCP/UDP

161

Simple Network Management Protocol.

SNMP-TRAPS

TCP/UDP

162

Traps for use with the SNMP (RFC:1215).

SQL-NET

TCP

1521

Structured Query Language is an interface to access 
data on many different types of database systems, 
including mainframes, midrange systems, UNIX 
systems and network servers.

SSH

TCP/UDP

22

Secure Shell Remote Login Program.

Commonly Used Services (continued)