User guide

Chapter 6: Network Menu and Forms 41
Firewall Configuration
Firewall configuration, also known as IP filtering, refers to the selective blocking of the passage of
IP packets between global and local networks. The filtering is based on rules that describe the
characteristics of the packet. For example, the contents of the IP header, the input/output interface
or the protocol.
This feature is used mainly in firewall applications to filter the packets that could potentially harm
the network system or generate unnecessary traffic in the network.
Selecting Network - Firewall Configuration displays the form shown in the following figure.
Figure 6.7: Expert - Network - Firewall Configuration
You can use the Firewall Configuration form to enable a firewall on the console server. You can
define rules to allow or disallow packets and configure filtering of packets that are sent and
received through the console server.
Each entry in the list on the Firewall Configuration form represents a chain with a set of rules.
By default the list has three built-in chains, as shown in the previous figure. The chains accept all
INPUT, FORWARD and OUTPUT packets. You can use the Edit, Delete, Add and Edit Rules
buttons on the form to perform the following to configure packet filtering:
Edit default chains
Delete user-added chains
Add new chains
Edit rules for chains
Edit button
Selecting one of the default chains and pressing the Edit button, the Edit Chain dialog box shown in
the following figure appears.