ZyXEL ADSL Prestige 660HW-61 130122.0660HW61 Manual Do Utilizador

Prestige 660H/HW Series User’s Guide

Chapter 13 Firewall Configuration

160

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)

Net Meeting uses this protocol.

HTTP(TCP:80) 

Hyper Text Transfer Protocol - a client/server protocol for the world 

wide web.

HTTPS

HTTPS is a secured http session often used in e-commerce.

ICQ(UDP:4000)

This is a popular Internet chat program.

IPSEC_TRANSPORT/

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.

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).

PPTP(TCP:1723)

Point-to-Point Tunneling Protocol enables secure transfer of data over 

public networks. This is the control channel.

PPTP_TUNNEL(GRE:0)

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.

Table 46    Predefined Services (continued)