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P-334U/P-335U User’s Guide
Chapter 11 Firewall 129
The following table describes the labels in this screen.
Table 45 Firewall General
LABEL DESCRIPTION
Enable 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.
Packet Direction This is the direction of travel of packets.
Firewall rules are grouped based on the direction of travel of packets to which they
apply.
Log Select whether to create a log for packets that are traveling in the selected
direction when the packets are blocked or forwarded.
To log packets related to firewall rules, make sure that Access Control under Log
is selected in the Logs > Log Settings screen.
Apply Click Apply to save the settings.
Reset Click Reset to start configuring this screen again.
11.3 Services Screen
Click Security > Firewall > Services. The screen appears as shown next.
If an outside user attempts to probe an unsupported port on your ZyXEL Device, an ICMP
response packet is automatically returned. This allows the outside user to know the ZyXEL
Device exists. Use this screen to prevent the ICMP response packet from being sent. This
keeps outsiders from discovering your ZyXEL Device when unsupported ports are probed.
You can also use this screen to enable service blocking, enter/delete/modify the services you
want to block and the date/time you want to block them.