Chapter 14 Firewall
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The following table describes the labels in this screen.
Table 61
Security > Firewall > Rules
LABEL
DESCRIPTION
Firewall Rules
Storage 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
traffic 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 ranges 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 firewall rule applies.
Action
This field displays whether the firewall silently discards packets (
Drop
), 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 which 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 screen where you can edit the rule.
Click the
Remove
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.
