User's Manual

Chapter 14 Firewall 156
The following table describes the labels in this screen.
Table 61 Se
curity > Firewall > Rules
LABEL DESCRIPTION
Firewall Rules
Stor
age Space in Use
This read-only bar shows how much of the Device'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 for which you
want to configure firewall rules.
Create a new rule
after rule number
Select an index number and click Add to add a new firewall rule after the selected
index number. For example, if you select “6”, your new rule becomes number 7 and
the previous rule 7 (if there is one) becomes rule 8.
The following read-only fields summarize the rules you have created that apply to
tr
affic traveling in the selected packet direction. The firewall rules that you configure
(summarized below) take priority over the general firewall action settings in the
General screen.
# This is your firewall rule number. The ordering of your rules is important as rules are
applied in turn.
Active This field displays whether a firewall is turned on or not. Select the check box to
enable the rule. Clear the check box to disable the rule.
Source IP Address This column displays the source addresses or r
anges of addresses to which this
firewall rule applies. Please note that a blank source or destination address is
equivalent to Any.
Destination IP
Address
This column 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 This column displays the services to which this f
irewall rule applies.
Action This field displays whether the firewall silently discards packets (Dr
op), discards
packets and sends a TCP reset packet or an ICMP destination-unreachable message
to the sender (Reject) or allows the passage of packets (Permit).
Source Interface This column displays the source interface to w
hich this firewall rule applies. This is
the interface through which the traffic entered the Device. Please note that a blank
source interface is equivalent to Any.
Destination Interface This column displays the destination interface to which this firewall rule applies. This
is the interface through which the traffic is destined to leave the Device. Please note
that a blank source interface is equivalent to Any.
Modify Click the Edit icon to go to the scr
een where you can edit the rule.
Click the Remo
ve icon to delete an existing firewall rule. A window displays asking
you to confirm that you want to delete the firewall rule. Note that subsequent
firewall rules move up by one when you take this action.