By default, the configuration includes a policy that matches all default application inspection traffic and applies inspection to the traffic on all interfaces (a global policy). Default application inspection traffic includes traffic to the default ports for each protocol. You can only apply one global policy, so if you want to alter the global policy, for example, to apply inspection to non-standard ports, or to add inspections that are not enabled by default, you need to either edit the default policy or disable it and apply a new one. For a list of all default ports
- Issue the policy-map global_policy command.
ASAwAIP-CLI(config)#policy-map global_policy
- Issue the class inspection_default command.
ASAwAIP-CLI(config-pmap)#class inspection_default
- Issue the inspect FTP command.
ASAwAIP-CLI(config-pmap-c)#inspect FTP
There is an option to use the inspect FTP strict command. This command increases the security of protected networks by preventing a web browser from sending embedded commands in FTP requests.
Example Configuration
ASA-AIP-CLI(config)#show running-config ASA Version 7.2(2) ! hostname ASA-AIP-CLI domain-name corp.com enable password WwXYvtKrnjXqGbu1 encrypted names ! interface Ethernet0/0 nameif Outside security-level 0 ip address 192.168.1.2 255.255.255.0 ! interface Ethernet0/1 nameif Inside security-level 100 ip address 10.1.1.1 255.255.255.0 ! interface Ethernet0/2 nameif DMZ security-level 50 ip address 172.16.1.12 255.255.255.0 ! interface Ethernet0/3 no nameif no security-level no ip address ! interface Management0/0 no nameif no security-level no ip address ! !--- Output is suppressed. !--- Permit inbound FTP control traffic. access-list 100 extended permit tcp any host 192.168.1.5 eq ftp !--- Permit inbound FTP data traffic. access-list 100 extended permit tcp any host 192.168.1.5 eq ftp-data ! !--- Command to redirect the FTP traffic received on IP 192.168.1.5 !--- to IP 172.16.1.5. static (DMZ,outside) 192.168.1.5 172.16.1.5 netmask 255.255.255.255 access-group 100 in interface outside class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp ! !--- This command tells the device to !--- use the "global_policy" policy-map on all interfaces. service-policy global_policy global prompt hostname context Cryptochecksum:4b2f54134e685d11b274ee159e5ed009 : end ASA-AIP-CLI(config)#
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