ZyXEL Communications eircom D1000, User Manual

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151
eircom D10
00 modem User’s Guide
Chapter 13 Firewall
13.4 The Rules Screen
Click Security > Firewall > Rules to display the following screen. This screen displays a list of the
configured firewall rules. Note the order in which the rules are listed.
Note: The firewall configuration screen shown in this section is specific to the following
devices: P-The ordering of your rules is very important as rules are applied in turn.
Figure 102
Security > Firewall > Rules
The following table describes the labels in this screen.
Table 57
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 ).