Zyxel-communications G.SHDSL.bis 4-port Security Gateway P-793H Bedienungsanleitung PDF herunterladen (Seite 136)

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P-793H User’s Guide

136 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 119 for more information.

Figure 56 Firewall > General

The following table describes the labels in this screen.

Table 38 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.

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