But as traffic volume mushrooms, it becomes less and less feasible to collect every flow. It’s easy to see per-host details, notice localized anomalies, and investigate particular flows. This granularity of NetFlow is attractive for examining traffic with an individual host. NetFlow aggregates data about all packets into flows locally at the device thus it can’t by happenstance miss a conversation by failing to sample the relevant packets. NetFlow’s partisans have long argued that NetFlow can be more accurate than sFlow. Here are the main differences between the two technologies. The differences between NetFlow and sFlowĪvi Freedman makes an apt analogy to monitoring vehicular traffic: “… while NetFlow can be described as observing traffic patterns (‘How many buses went from here to there?’), with sFlow you’re just taking snapshots of whatever cars or buses happen to be going by at that particular moment”. Influxdata’s TICK Stack Telegraf, Influxdb, Chronograf, and Kapacitor are network data collection and analysis tools that can use sFlow and SNMP.Elastic Stack Log file collection and analysis tools that can be adapted to work with NetFlow.Splunk A well-known and highly respected packet sniffer that can collect data by analysis through more sophisticated tools.Kentik Detect A cloud-based service that can analyze your on-premises traffic.
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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.
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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.