This can become a problem with high-speed devices where many conversations are concentrated onto a link. Device performance at high volumesĪs noted above, sFlow does minimal work on the network device, versus NetFlow which uses the device’s CPU and RAM to implement the flow cache. For detecting and drilling down to investigate security issues, this can be significant. The packets sampled may not reflect every flow (for instance, short bursts). However, sampling has the downside that there may be gaps in visibility. SFlow is thus more scalable than traditional NetFlow. If you’re not doing sampling, scalability becomes an issue. 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”.
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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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.
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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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