ZyXEL Communications P-660HWP-D1, User Manual

Page: 165 / 374

Chapter 11 Firewall Configuration
P-660HWP-D1 User’s Guide
165
The following table describes the labels in this screen.
11.6 Firewall Rules Summary
"
The ordering of your rules is very important as rules are applied in turn.
Refer to Section 10.1 on page 149 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.
Table 59 Firewall: General
LABEL DESCRIPTION
Active Firewall Select this check box to activate the firewall. The P-660HWP-D1 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 P-660HWP-D1 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 J on page 35 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 P-660HWP-D1 or the P-660HWP-D1 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 to the P-660HWP-D1.
Cancel Click Cancel to begin configuring this screen afresh.