Over the last few days I've been writing and talking a lot about NetFlow. This is a smokin' hot topic for network engineers nowadays and so we've created some new videos and webcasts to help explain the technology and how you can leverage it. One of the subjects that kept coming up is how to get NetFlow data from your Cisco ASAs. I had to do some research to verify my understanding of how this worked but now that I'm done I thought I should share it here. When most of us think about NetFlow, we think about traffic analysis. When you enable NetFlow on a router or switch...

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A little while back I wrote a blog post on network traffic analysis using NetFlow and talked specifically about NetFlow support on the Csico ASAs. One of the primary uses for NetFlow on the Cisco ASAs is as a tranport protocol for security events. That said, recently we learned that you can use NetFlow for traffic analysis on the Cisco ASAs, which is different than I'd understood at the time I wrote that post. Long story short, not only can you now analyze traffic using NetFlow on the Cisco ASAs but the Orion NetFlow Traffic Analyzer (Orion NTA) version 3.5 SP2 now supports this...

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