ZyXEL Communications 2 Plus User Manual

Chapter 11 Firewall

ZyWALL 2 Plus User’s Guide

In the Rule Summary screen, click the edit icon or the insert icon to display the Firewall Edit 
Rule screen. 
Use this screen to create or edit a firewall rule. Refer to the following table for information on 
the labels.
See 

 for more information about the firewall.

The following fields summarize the rules you have created that apply to traffic traveling in the selected 

packet direction. The firewall rules that you configure (summarized below) take priority over the 

general firewall action settings above.

#

This is your firewall rule number. The ordering of your rules is important as rules are 

applied in turn. Click + to expand or - to collapse the Source Address, Destination 

Address and Service Type drop down lists.

Name

This is the name of the firewall rule.

Active

This field displays whether a firewall is turned on (Y) or not (N). Click the setting to 

change it.

Source Address

This drop-down list box displays the source addresses or ranges of addresses to 

which this firewall rule applies. Please note that a blank source or destination 

address is equivalent to Any.

Destination 

Address

This drop-down list box displays the destination addresses or ranges of addresses 

to which this firewall rule applies. Please note that a blank source or destination 

address is equivalent to Any.

Service Type

This drop-down list box displays the services to which this firewall rule applies. 

Custom services have an * before the name. See 

of common services.

Action

This field displays whether the firewall silently discards packets (Drop), discards 

packets and sends a TCP reset packet or an ICMP destination-unreachable 

message to the sender (Reject) or allows the passage of packets (Permit).

Sch.

This field tells you whether a schedule is specified (Yes) or not (No).

Log

This field shows you whether a log is created when packets match this rule (Yes) or 

not (No).

Modify

Click the edit icon to go to the screen where you can edit the rule.
Click the delete icon to delete an existing firewall rule. A window displays asking you 

to confirm that you want to delete the firewall rule. Note that subsequent firewall 

rules move up by one when you take this action.
Click the insert icon to display the screen where you can configure a new firewall 

rule. The insert icon at the top of the row creates the new firewall rule before the 

others. The individual firewall rule insert icons create a new firewall rule after the 

row’s firewall rule.
Click the move icon, type an index number, and press Enter to move the rule to the 

number that you typed. The ordering of your rules is important as they are applied in 

order of their numbering.

Table 50   SECURITY > FIREWALL > Rule Summary