26 Avocent PM PDU Installer/User Guide
Firewall
Administrators can configure the PM PDU to act as a firewall. By default, three built-in chains
accept all INPUT, FORWARD and OUTPUT packets. Select the Add, Delete or Change Policy
buttons to add a user chain, delete user added chains and to change the built-in chains policy.
Default chains can have their policy changed (Change Policy) to accept or drop, but cannot be
deleted. Clicking on the Chain Name allows you to configure rules for chains.
Firewall configuration is available by clicking Network - Fir
ewall. Separate but identical
configuration screens are available from either the IPv4 Filter Table or IPv6 Filter Table menu
options.
Only the policy can be edited for a default chain; default chain policy options are ACCEPT and
DROP.
When a chain is added, only a named entry for the chain is
created. One or more rules must be
configured for a chain after it is added.
Configuring the firewall
For each rule, an action (either ACCEPT, DROP, RETURN,
LOG or REJECT ) must be selected
from the Target pull-down menu. The selected action is performed on an IP packet that matches all
the criteria specified in the rule.
If LOG is selected from
the Target pull-down menu, an administrator can configure a Log Level, a
Log Prefix and whether the TCP sequence, TCP options and IP options are logged in the Log
Options Section.
If REJECT
is selected from the Target pull-down menu, an administrator can select an option from
the Reject with pull-down menu; the packet is dropped and a reply packet of the selected type is
sent.
Protocol options
Different fields are activated for each option in the
Protocol pull-down menu.
•If Numeric is s
elected from the Protocol menu, enter a Protocol Number in the text field.
•If TCP is select
ed from the Protocol menu, a TCP Options Section is activated for entering
source and destination ports and TCP flags.
•If UDP i
s selected from the Protocol menu, the UDP section is activated for entering source
and destination ports.
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