Cisco Systems IP Options Inspection

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Cisco ASA Series Firewall CLI Configuration Guide
Chapter10 Configuring Inspection of Basic Internet Protocols
IP Options Inspection
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 2-4.
Step7 Specify the action you want to perform on the matching traffic by entering the following command:
ciscoasa(config-pmap-c)# {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 an IM inspection policy map.
hostname(config)# regex loginname1 “ying\@yahoo.com”
hostname(config)# regex loginname2 “Kevin\@yahoo.com”
hostname(config)# regex loginname3 “rahul\@yahoo.com”
hostname(config)# regex loginname4 “darshant\@yahoo.com”
hostname(config)# regex yahoo_version_regex “1\.0”
hostname(config)# regex gif_files “.*\.gif”
hostname(config)# regex exe_files “.*\.exe”
hostname(config)# class-map type regex match-any yahoo_src_login_name_regex
hostname(config-cmap)# match regex loginname1
hostname(config-cmap)# match regex loginname2
hostname(config)# class-map type regex match-any yahoo_dst_login_name_regex
hostname(config-cmap)# match regex loginname3
hostname(config-cmap)# match regex loginname4
hostname(config)# class-map type inspect im match-any yahoo_file_block_list
hostname(config-cmap)# match filename regex gif_files
hostname(config-cmap)# match filename regex exe_files
hostname(config)# class-map type inspect im match-all yahoo_im_policy
hostname(config-cmap)# match login-name regex class yahoo_src_login_name_regex
hostname(config-cmap)# match peer-login-name regex class yahoo_dst_login_name_regex
hostname(config)# class-map type inspect im match-all yahoo_im_policy2
hostname(config-cmap)# match version regex yahoo_version_regex
hostname(config)# class-map im_inspect_class_map
hostname(config-cmap)# match default-inspection-traffic
hostname(config)# policy-map type inspect im im_policy_all
hostname(config-pmap)# class yahoo_file_block_list
hostname(config-pmap-c)# match service file-transfer
hostname(config-pmap)# class yahoo_im_policy
hostname(config-pmap-c)# drop-connection
hostname(config-pmap)# class yahoo_im_policy2
hostname(config-pmap-c)# reset
hostname(config)# policy-map global_policy_name
hostname(config-pmap)# class im_inspect_class_map
hostname(config-pmap-c)# inspect im im_policy_all
IP Options Inspection
This section describes the IP Options inspection engine. This section includes the following topics: