ZyXEL Communications 4728F User Manual

 Appendix A Common Services

XGS-4526/4528F/4728F User’s Guide

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 
Program.

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.

STRM WORKS

UDP

1558

Stream Works Protocol.

SYSLOG

UDP

514

Syslog allows you to send system logs 
to a UNIX server.

TACACS

UDP

49

Login Host Protocol used for (Terminal 
Access Controller Access Control 
System).

Table 175   Commonly Used Services (continued)