Over  the last few weeks I have taken a number of support calls from customers who were looking for some assistance configuring their Cisco ASA. So I figured that I would take this opportunity to revisit some older blog subjects.

In my opinion, the easiest way to get NSEL exporting from these security appliances is through the use of the ASDM interface. This simple, GUI-based firewall management tool allows you to quickly configure the Cisco ASA without having to use the cumbersome command-line interface.

And that brings me to the subject of this blog.

Configuring the Cisco ASA using the CLI is really not that much different that configuring NetFlow on any other router or switch. You define your timeout value, flow export destination, and which interface is going to send the export. The difference is that you need to set up a service policy, and access rules that allow the export. As well as define which events are going to get exported and where.

So let’s get started.

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