Using many sensor on AIP-SSM 20

[nguyenthinh]

I have an ASA 5540 with AIP-SSM20. I use Gi0/0 for DMZ1 and Gi0/1 for DMZ2, then I create two virtual sensor: vs0 and Vs1. Could I use policy-map to force vs0 to protect servers in DMZ1 and vs1 to protect servers in DMZ2?

Thank every one alot ! 

[Diego Armando Cambronero Arias]

Hello,

Yes you can do that. Just create 2 ACL to match the traffic that you want to monitor.

Here is the link to configure the AIP-SSM

http://www.cisco.com/en/US/docs/security/ips/5.1/configuration/guide/cli/cliSSM.html#wp1033926

Check this out

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00807335ca.shtml#c4

ciscoasa#configure terminal
ciscoasa(config)#access-list traffic_for_ips deny ip 10.2.2.0 255.255.255.0 192.168.1.0 255.255.255.0 
ciscoasa(config)#access-list traffic_for_ips permit ip any 192.168.1.0 255.255.255.0 
ciscoasa(config)#access-list traffic_for_ips deny ip 192.168.1.0 255.255.255.0 10.2.2.0 255.255.255.0 
ciscoasa(config)#access-list traffic_for_ips permit ip 192.168.1.0 255.255.255.0 any 
ciscoasa(config)#class-map ips_class_map 
ciscoasa(config-cmap)#match access-list traffic_for_ips
ciscoasa(config)#policy-map interface_policy
ciscoasa(config-pmap)#class ips_class_map
ciscoasa(config-pmap-c)#ips inline fail-open 
ciscoasa(config)#service-policy interface_policy interface dmz

Apply the Service policy in the DMZ1 and in the DMZ2
Of course the ACL are doing to be different.
I think that in the command 
ciscoasa(config-pmap-c)#ips inline fail-open

you can specify the VS0 or VS1
check this with the interrogation key (?)
Hope it helps.

[nguyenthinh]

Thank for your kindly reply!

I still have an unclear thing. I create two virtual sensors but ASA and AIP-SSM just have one backplane interface Gi0/1; how can I map one interface to two virtual sensors?

[Scott Fringer]

Please reference the following link for more specifics on assigning multiple virtual sensors within the ASA;

http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/ips.html

The traffic across the backplane is tagged so that it is accepted by the correct VS once it reaches the AIP-SSM for inspection.

Scott