We have a PRTG Probe in our office's Domain Controller, and we are trying to configure NetFlow on our leased Cisco ASA 5520 ver 8.2(5) We have done the following on the Cisco:

conf t
access-list netflow-traffic extended permit ip any any
class-map netflow traffic
 match acl netflow
flow-export destination inside 2056
policy-map global-policy
flow-export event-type all destination

Checking commands:

show flow-export counters  --> it shows few results
show logging flow-export

On the PRTG it is still showing not active; am I doing something wrong?

  • On which interfaces, in which direction are you applying NetFlow? – Ron Maupin Sep 6 '17 at 1:09
  • @Hadi QJ Please let me know if my answer below solve your problem. – Hung Tran Sep 17 '17 at 8:37
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer. – Ron Maupin Feb 21 '18 at 17:43

I am not sure whether there are typos in your code lines above when you typed in or they are exactly what you have in your current configuration, but I noticed that:

  • class-map netflow traffic seems not to be right.
  • match acl netflow is wrong, it should be match access-list netflow-traffic as you named your ACL as netflow-traffic
  • You may need to put netflow-related class-map under global policy-map
  • You may need delay flow-create and/or template timeout-rate

I would propose the following lines (exclude delay flow-create, you can try if it still does not work):

access-list netflow-traffic extended permit ip any any
flow-export destination inside 2056
flow-export template timeout-rate 1
class-map netflow-traffic-class
 match access-list netflow-traffic
policy-map global_policy
 class netflow-traffic-class
  flow-export event-type all destination

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