Avocent Cyclades ACS, Инструкция по установке/администрированию/использованию

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Chapter 7: Network Menu and Forms 99
NOTE: In addition to SNMP configuration described in this section, you need to make sure SNMP service is
enabled and configured for one or more serial ports in order to send SNMP traps.
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 7.13: 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 console server.
Packet filtering relies on defined chains and rules. See Packet Filtering on page 6 for details.
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