ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

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Chapter 11 Firewall Screens

Click SECURITY, FIREWALL to open the Default Rule screen. Enable (or activate) the 
firewall by selecting the Enable Firewall check box.

Use this screen to configure general firewall settings when the ZyWALL is set to router mode.

Figure 96   Default Rule (Router Mode)

The following table describes the labels in this screen. 

Table 67   Default Rule (Router Mode) 

Enable Firewall

Select this check box to activate the firewall. The ZyWALL performs access control 

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

Allow 

Asymmetrical 

Route

Select this check box to have the ZyWALL firewall permit the use of triangle route 

topology on the network. 

Note: Allowing asymmetrical routes may let traffic from the WAN go 

directly to a LAN computer without passing through the 
ZyWALL. See 

 for more on triangle 

route topology and how to deal with this problem.