ZyXEL Communications ADSL2+4 User Manual

 Appendix D Services

P-660H-T1v3s User’s Guide

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.

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).

POP3S

TCP

995

This is a more secure version of POP3 
that runs over SSL.

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.

ROADRUNNER

TCP/UDP

1026

This is an ISP that provides services 
mainly for cable modems.

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. 

Table 75   Examples of Services (continued)