ZyXEL Communications VSG1432-B101 Series Manual De Usuario

VSG1432-B101 Series User’s Guide

This chapter shows you how to enable and configure the ZyXEL Device firewall. 
Use the firewall to protect your ZyXEL Device and network from attacks by 
hackers on the Internet and control access to it. By default the firewall:

• allows traffic that originates from your LAN computers to go to all other 

networks. 

• blocks traffic that originates on other networks from going to the LAN. 

The following figure illustrates the default firewall action. User A can initiate an IM 
(Instant Messaging) session from the LAN to the WAN (1). Return traffic for this 
session is also allowed (2). However other traffic initiated from the WAN is blocked 
(3 and 4).

Figure 91   Default Firewall Action

• Use  the  Firewall screen to configure the security level of the firewall on the 

ZyXEL Device (

• Use  the  Protocol screen to add or remove predefined Internet services and 

configure firewall rules (

• Use  the  Access Control screen to view and configure incoming/outgoing 

filtering rules (

). 

3
4

1
2