ZyXEL Communications P-661H Series, User Manual, Page: 162 / 383

P-661H/HW Series User’s Guide
162 Chapter 9 Firewall Configuration
9.6 General Firewall Policy
Click Security > Firewall to display the following screen. Activate the firewall by selecting
the Active Firewall check box as seen in the following screen.
Refer to Section 8.1 on page 145 for more information.
Figure 86 Firewall: General
The following table describes the labels in this screen.
Table 60 Firewall: General
LABEL DESCRIPTION
Active 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.
Bypass Triangle
Route
Select this check box to have the ZyXEL Device firewall permit the use of triangle
route topology on the network. See the appendix for more on triangle route
topology.
Note: Allowing asymmetrical routes may let traffic from the WAN go
directly to a LAN computer without passing through the
router. See
Appendix M on page 366 for more on triangle
route topology and how to deal with this problem.
Packet Direction This is the direction of travel of packets ( LAN to LAN / Router , LAN to WAN , WAN
to WAN / Router , and WAN to LAN) .
Firewall rules are grouped based on the direction of travel of packets to which they
apply. For example, LAN to LAN / Router means packets traveling from a
computer/subnet on the LAN to either another computer/subnet on the LAN
interface of the ZyXEL Device or the ZyXEL Device itself.