FlowViewer provides a convenient web-based user interface to Mark Fullmer’s flow-tools suite and CMU's netflow data capture/analyzer, SiLK. The inclusion of the underlying SiLK tool set enables FlowViewer users to continue to use the tool with the newer IPFIX netflow data protocol, which includes support for IPv6 and Cisco's v9 and FNF netflow.

FlowViewer has been developed for NASA’s Earth Sciences Data and Information System (ESDIS) networks, and credit goes to NASA for their usual outstanding support of innovation.

The FlowViewer tools provide additional graphing and tracking features by utilizing open source software including Thomas Boutrell’s gd, Lincoln Stein's GD, Martien Verbruggen's GD::Graph, and Tobias Oetiker’s RRDtool.

FlowViewer v4.6 fixes non-UTC local time environments for FlowViewer and FlowGrapher, and $no_devices_or_exporters FlowMonitor_Collector problem.

**Note: SiLK must be v3.8.0 or later. Version 3.9 handles sFlow data.


  • Complete open-source netflow collector analyzer
  • Web-based user interface provides dynamic front-end to open source collectors
  • Dashboard provides user with immediate network traffic 'situational awareness'
  • Ability to analyze IPFIX netflow (e.g., v9) data captured by SiLK
  • Ability to continue to support netflow v5 installations via flow-tools
  • Users can graph filtered traffic sets across a specified time period
  • Background software tracks filtered traffic over the long-term (ala MRTG)
  • Ability to save filters and reports for later use and review

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User Reviews

  • very nice tool, the engine is good and has everything you might expect from a tool like that; some usability features still lack though (e.g. graph title in dashboards).

  • Excellent tool and excellent support!

  • How about mySQL? read please Discussion page.

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Information Technology, Telecommunications Industry, Security Professionals

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