ZyXEL Communications Internet Security Gateway ZyWALL 2 Series - Manual (Page 163)

ZyWALL 2 Series User’s Guide
Firewall Screens 11-7
Table 11-1 Firewall Rules Summary: First Screen
LABEL DESCRIPTION
Enable Firewall Select this check box to activate the firewall. The ZyWALL 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 ZyWALL firewall ignore the use of triangle route
topology on the network. See the Appendices for more on triangle route topology.
Firewall Rules
Storage Space in
Use This read-only bar shows how much of the ZyWALL's memory for recording firewall
rules it is currently using. When you are using 80% or less of the storage space, the
bar is green. When the amount of space used is over 80%, the bar is red.
Packet Direction Use the drop-down list box to select a direction of travel of packets (LAN to
LAN/ZyWALL, LAN to WAN, WAN to LAN, WAN to WAN/ZyWALL) for which you
want to configure firewall rules.
Block/
Forward Use the option buttons to select whether to Block (silently discard) or Forward
(allow the passage of) packets that are traveling in the selected direction.
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 the rules below.
The following read-only fields summarize the rules you have created that apply to traffic traveling in the
selected packet direction. The firewall rules that you configure (summarized below) take priority over the
general firewall action settings above.
# This is your firewall rule number. The ordering of your rules is important as rules are
applied in turn. The Move field below allows you to reorder your rules.
Status This field displays whether a firewall is turned on (Active) or not (Inactive). Rules
that have not been configured display Empty.
Source Address This drop-down list box displays the source addresses or ranges of addresses to
which this firewall rule applies. Please note that a blank source or destination
address is equivalent to Any.
Destination
Address This drop-down list box displays the destination addresses or ranges of addresses to
which this firewall rule applies. Please note that a blank source or destination
address is equivalent to Any.
Service Type This drop-down list box displays the services to which this firewall rule applies.
Please note that a blank service type is equivalent to Any. See Table 11-5 for more
information.
Action This is the specified action for that rule, either Block or Forward. Note that Block
means the firewall silently discards the packet.
Schedule This field tells you whether a schedule is specified (Yes) or not (No).