ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 - Manual (Page 215)

ZyWALL 5/35/70 Series User’s Guide
215 Chapter 11 Firewall Screens
11.6 Firewall Default Rule (Router Mode)
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)
LABEL DESCRIPTION
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
Appendix I on page 718 for more on triangle
route topology and how to deal with this problem.