ntop traffic monitoring
Just like SNMP in the previous chapter, we can use Python scripts and other tools to directly poll the device. However, there are tools such as Cacti, which is an all-in-one open source package, that includes data collection (poller), data storage (RRD), and a web frontend for visualization.
In the case of NetFlow, there are a number of open source and commercial NetFlow collectors you can choose from. If you do a quick search for "top N open source NetFlow analyzer," you will see a number of comparison studies for different tools. Each one of them has their own strong and weak points; which one to use is really a matter of preference, platform, and your appetite for customization. I would recommend choosing a tool ...
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