ZyXEL Communications P-2602 Firewall Rules Summary, Firewall General, Firewall Configuration 197

P-2602H(W)(L)-DxA Series User’s Guide

The following table describes the labels in this screen.

Table 70 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	Select this check box to have the ZyXEL Device firewall permit the use of triangle
Route	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 H on page 377 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, 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.
Default Action	Use the drop-down list boxes to select the default action that the firewall is take on
	packets that are traveling in the selected direction and do not match any of the
	firewall rules.
	Select Drop to silently discard the packets without sending a TCP reset packet or
	an ICMP destination-unreachable message to the sender.
	Select Reject to deny the packets and send a TCP reset packet (for a TCP packet)
	or an ICMP destination-unreachable message (for a UDP packet) to the sender.
	Select Permit to allow the passage of the packets.
Log	Select the check box to create a log (when the above action is taken) for packets
	that are traveling in the selected direction and do not match any of your customized
	rules.
Expand...	Click this button to display more information.
Basic...	Click this button to display less information.
Apply	Click Apply to save your changes back to the ZyXEL Device.
Cancel	Click Cancel to begin configuring this screen afresh.

14.6 Firewall Rules Summary

Note: The ordering of your rules is very important as rules are applied in turn.

Refer to Section 13.1 on page 181 for more information.

Click Security > Firewall > Rules to bring up the following screen. This screen displays a list of the configured firewall rules. Note the order in which the rules are listed.

Chapter 14 Firewall Configuration 197