Cisco 6500 - Catalyst Series 10 Gigabit EN Interface Module Expansion, Configuration Manual, Page: 443 / 742

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Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
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Chapter 22 Applying Application Layer Protocol Inspection
ESMTP Inspection
To create an ESMTP inspection policy map, perform the following steps:
Step 1
(Optional) Add one or more regular expressions for use in traffic matching commands according to the
“Creating a Regular Expression” section on page 20-11 . See the types of text you can match in the match
commands described in Step 3 .
Step 2 (Optional) Create one or more regular expression class maps to group regular expressions according to
the
“Creating a Regular Expression Class Map” section on page 20-14 .
Step 3
Create an ESMTP inspection policy map, enter the following command:
hostname(config)#
policy-map type inspect esmtp
policy_map_name
hostname(config-pmap)#
Where the policy_map_name is the name of the policy map. The CLI enters policy-map configuration
mode.
Step 4
(Optional) To add a description to the policy map, enter the following command:
hostname(config-pmap)# description string
Step 5 To apply actions to matching traffic, perform the following steps.
a.
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 Catalyst
6500 Series Switch and Cisco 7600 Series Router Firewall Services Module 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 20-7 .
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 configure a local domain name, enter the following command:
hostname(config-pmap-p)# mail-relay domain-name action [ drop-connection | log ]]