ASA's NetFlow with Flow Monitor plug-in of WhatsUp Gold

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Dec 11th, 2009
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Has anybody ever done ASA's NetFlow with Flow Monitor plug-in of WhatsUp Gold? I am running ASA 8.2.1 and WhatsUp Gold 14.1. NetFlow is already configured on the ASA. However, the Flow Monitor home page displayed only 2 interfaces; one is Adaptive Security Appliance '0' interface and the other one is 'Null0' interface. Would you please advise?

Thank you very much,


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jakewilson Sun, 01/03/2010 - 05:15
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The plixer blog has a decent post on enabling NetFlow on the ASA:

The above is specific to Scrutinizer for collecting NetFlow but, it should work for WUG as well.

Keep in mind that that there are some issues when exporting NetFlow from the ASA:  Check out this PDF:


nitass Sun, 01/03/2010 - 08:44
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Hi Jake,

Thanks for the URLs. Actually, I exported NetFlow to both WUG and Scrutinizer. Both of them displayed 2 interfaces; one is 0 and the other one is Null0. However, I was able to get data bytes statistic information on interface 0 in Scrutinizer but I got nothing about data bytes on interface 0 in WUG.

What ASA platform have you enabled NetFlow with Scrutinizer or any other analyzer software? If it is 5505, how many interfaces did you get? What was each interface name?


jakewilson Wed, 01/06/2010 - 02:49
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Sorry I'm so slow to respond.  I only check that email a few times per week.   We have a ASA 5520 but, loads of our customers have 5580's and other models.  I'm not sure why other interfaces don't show up for you but, keep in mind that the interface indexes exported by NetFlow will not line up with the interface indexes reported by SNMP.   We have already escalated this to Cisco.

The ASA is a tricky beast when it comes to NetFlow.  I'm confident that the technology will change considerably in future software updates.  That PDF url above points out some challenging issues to deal with when interpreting the NetFlow data from the ASA. I've already suggested to the marketing guys to make the next Mix Master Mitch video on the ASA:

If interfaces aren't showing up that you feel should appear, I haven't run into this.  Call the plixer sales department and ask them.  They will likely run over to support and ask around.   You might get the answer you need.

nitass Wed, 01/06/2010 - 06:00
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Hi Jake,

That is alright. I so appreciate your helping. I will post here if I have any update about this issue.

Thank you very much,



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