
12-2 IP Firewall
LX Series Configuration Guide
IP Firewall
The MRV Graphical User Interface (GUI) provides a simple,
limited method for configuring iptables.
The following IP Firewall GUI feature procedure uses terms
which may not be familiar. These terms are defined as follows:
A firewall consists of several rules for establishing (or setting)
the input and output firewall policies. There is now a new
Firewall menu item in the GUI Configuration Console. When you
click on Firewall, the GUI gathers the firewall information from
the LX unit. If the GUI detects an advanced firewall
configuration in system iptables (advance firewall configurations
are created through the shell level only, and the GUI can’t
recognize these rules) a confirmation window appears:
If you click Yes, the GUI loads the previous firewall
configuration, saves a copy of iptables, overwrites iptables, and
automatically displays a filled-in input table. If no previous
firewall is detected, a blank input table appears.
Term Definition Example
Chain
A grouping of rules that
specifies when the rules
should be applied to traffic
(
INPUT
,
OUTPUT
)
source ip address x.x.x.x
destination port 23
Rule The actual filter definition
source ip address x.x.x.x
destination port 23
Policy
The action to the rule
(
Accept
or
Drop
)
source ip address x.x.x.x
destination port 23 drop
source ip address x.x.x.x
destination port 23 accept
Default
Policy
The default action of the entire chain. If a packet makes it
through all the rules in a chain, the default policy decides which
final action to take (
Accept
or
Drop
)
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