ZyXEL p-334wh Guia Do Utilizador

P-334WH User’s Guide

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Chapter 12 Firewall

The following table describes the labels in this screen.

Table 53   Firewall General

Enable Firewall

Select this check box to activate the firewall. The ZyXEL Device performs access 

control and protects against Denial of Service (DoS) attacks when the firewall is 

activated.

Packet Direction

This is the direction of travel of packets.
Firewall rules are grouped based on the direction of travel of packets to which they 

apply. 

Log

Select whether to create a log for packets that are traveling in the selected 

direction when the packets are blocked or forwarded.
To log packets related to firewall rules, make sure that Access Control under Log 

is selected in the Logs > Log Settings screen. 

Apply

Click Apply to save the settings. 

Reset

Click Reset to start configuring this screen again. 

Click Security > Firewall > Services. The screen appears as shown next. 

If an outside user attempts to probe an unsupported port on your ZyXEL Device, an ICMP 
response packet is automatically returned. This allows the outside user to know the ZyXEL 
Device exists. Use this screen to prevent the ICMP response packet from being sent. This 
keeps outsiders from discovering your ZyXEL Device when unsupported ports are probed.

You can also use this screen to enable service blocking, enter/delete/modify the services you 
want to block and the date/time you want to block them.