02-01-2024 07:06 PM
Cisco ASA send NSEL data . "Netflix Secure Event Logging.
Hello I bit confuse how the 3 map are configure are and what they do.
can some please tell me if I am correct how ASA is setup to send DATA to NSEL.
Policy Map = setup to collect IP address
Class Map = setup to match policy
Service Map = setup to apply policy globally .
02-02-2024 03:06 AM
In ASA CLI this looks as follows. ACL defines traffic. Connections that match ACL will trigger NetFlow event generation. Class-map refers to ACL and policy-map (which is applied by default via service-policy CLI) activates the feature.
flow-export destination inside <IP> <UDP-port>
flow-export template timeout-rate 1
flow-export active refresh-interval 1
access-list netflow-hosts extended permit ip any any
class-map NetFlow-traffic
match access-list netflow-hosts
policy-map global_policy
class NetFlow-traffic
flow-export event-type all destination <IP>
logging flow-export-syslogs disable
Last command is optional. It blocks flow creation/teardown syslogs to reduce load, because the same information is sent via NetFlow to NetFlow collector.
02-02-2024 03:19 AM - edited 02-02-2024 03:26 AM
Class map - matches on traffic that you will apply actions to
policy map - applies actions to the class-map
service policy - applies the policy map to specified interface or globally
02-02-2024 03:35 AM
The order is
A-Class-map
Here you have two choices
1- match acl' this use if you want to match only traffic between two points (these points can hosts or subnet)
2- class-default This for all traffic
B- Policy-map
This use class you define in step A
The action is different here it can
1- flow-export (flow export is send details of traffic to specific destination) event-type ALL ( all even send to one destiantion)
2- flow-export event-type ___ here you can select event creation denied update teardown...
This make you send each event-type to specific destination not all event send to same destination.
C- service-policy here you use what you add in step B
That all friend
MHM
02-02-2024 09:05 AM
WOW... thank you so much....
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