ZyXEL Communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNLI - Manual (Page 217)

P-2602HWNLI User’s Guide
Chapter 14 Firewall Configuration 217
Figure 112 Firewall: General
The following table describes the labels in this screen.
Table 76 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.
Note: Allowing asymmetrical routes may let traffic from the WAN go
directly to a LAN computer without passing through the
router. See
Section 14.5 on page 214 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 to 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.