ZyXEL g-2000 plusv2 Guia Do Utilizador

ZyXEL G-2000 Plus v2 User’s Guide

Chapter 11 Firewall Screens

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Figure 65   My Service Example Rule Summary 

Rule 1: Allows a My Service connection from the WAN to IP addresses 10.0.0.10 through 
10.0.0.15 on the LAN.

The Available Services list box in the Edit Rule screen (

) displays all predefined 

services that the ZyXEL device already supports. Next to the name of the service, two fields 
appear in brackets. The first field indicates the IP protocol type (TCP, UDP, or ICMP). The 
second field indicates the IP port number that defines the service. (Note that there may be 
more than one IP protocol type. For example, look at the default configuration labeled (DNS). 

 means UDP port 53 and TCP port 53. Custom services may also be configured 

using the Custom Services function discussed previously.

Table 53   Predefined Services

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.