Kentik A cloud-based service that can analyze your on-premises traffic. 
Nagios XI and Core An extensive network monitoring system in both free (Nagios Core) and paid (Nagios XI) versions. Noction Flow Analyzer Watches over live network performance as well as offering network traffic analysis. Plixer Scrutinizer A cybersecurity activity monitor that is available for installation, as a cloud-based service, or as an appliance. Nprobe and ntopng A straightforward network monitoring system in both free and paid versions. Paessler PRTG Network Monitor (FREE TRIAL) NetFlow, sFlow, and J-Flow sensors that form part of a network, server, and application monitor. Site24x7 Network Traffic Monitoring (FREE TRIAL) A cloud service that tracks live network traffic data and offers capacity planning support. ManageEngine NetFlow Analyzer (FREE TRIAL) A traffic analyzer that installs on Windows Server and Linux and deploys the NetFlow, IPFIX, J-Flow, NetStream standards. SolarWinds NetFlow Traffic Analyzer EDITOR’S CHOICE The leading network traffic analyzer. Here’s our list of the best NetFlow analyzers & collectors: Its knowledge of the IP protocols enables it to interpret packets and work in terms of flows. NetFlow thus only handles IP, focusing on OSI model Layers 3 and 4. NetFlow is stateful and works in terms of the abstraction called a flow: that is, a sequence of packets that constitutes a conversation between a source and a destination, analogous to a call or connection.Ī NetFlow exporter device collects data on the IP traffic entering/exiting the device it inspects packets and groups them into flows by inspecting particular fields: the source and destination addresses, protocols, ports, etc.ĭata on observed flows is rolled up from the packets and cached locally (in the flow cache), then it’s periodically exported to the collector based on active and inactive timeouts. 
NetFlow is a network protocol developed by Cisco that notes and reports on all IP conversations passing through an interface.
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