Welcome to the first installment of our NetFlow v9 Overview, beginning (of course!) with NetFlow basics.
What is NetFlow?
A network flow is defined as a unidirectional sequence of packets between given source and destination endpoints. Traditional NetFlow uses a 7-tuple of source and destination IP address, transport layer port numbers, IP Protocol, Type of Service (ToS), and the input interface port to uniquely identify flows. Flexible NetFlow (FNF) is a ground-up rewrite of NetFlow which allows the user to customize the NetFlow tuple to include (or exclude) a nearly infinite amount of different fields.
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Sr. Solutions Engineer
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