Cisco 500 Series, Configuration Manual

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Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 25 Configuring Application Layer Protocol Inspection
NetBIOS Inspection
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Specify traffic directly in the policy map using one of the match commands described in Step 3 .
If you use a match not command, then any traffic that does not match the criterion in the match
not command has the action applied.
b. Specify the action you want to perform on the matching traffic by entering the following command:
hostname(config-pmap-c)# {[ drop [ send-protocol-error ] |
drop-connection [ send-protocol-error ]| mask | reset ] [ log ] | rate-limit message_rate }
Not all options are available for each match or class command. See the CLI help or the Cisco
Security Appliance Command Reference for the exact options available.
The drop keyword drops all packets that match.
The send-protocol-error keyword sends a protocol error message.
The drop-connection keyword drops the packet and closes the connection.
The mask keyword masks out the matching portion of the packet.
The reset keyword drops the packet, closes the connection, and sends a TCP reset to the server
and/or client.
The log keyword, which you can use alone or with one of the other keywords, sends a system log
message.
The rate-limit message_rate argument limits the rate of messages.
You can specify multiple class or match commands in the policy map. For information about the order
of class and match commands, see the “Defining Actions in an Inspection Policy Map” section on
page 21-11 .
Step 6 To configure parameters that affect the inspection engine, perform the following steps:
a.
To enter parameters configuration mode, enter the following command:
hostname(config-pmap)#
parameters
hostname(config-pmap-p)#
b. To check for NETBIOS protocol violations, enter the following command:
hostname(config-pmap-p)# protocol-violation [ action [ drop-connection | reset | log ]]
Where the drop-connection action closes the connection. The reset action closes the connection
and sends a TCP reset to the client. The log action sends a system log message when this policy map
matches traffic.
The following example shows how to define a NETBIOS inspection policy map.
hostname(config)# policy-map type inspect netbios netbios_map
hostname(config-pmap)# protocol-violation drop log
hostname(config)# policy-map netbios_policy
hostname(config-pmap)# class inspection_default
hostname(config-pmap-c)# inspect netbios netbios_map