- Home
- Network Traffic Analysis Software
- FlowViewer
FlowViewer
What it is
FlowViewer is free software for analyzing Netflow data exported from an organization’s network devices. It provides an interface to Carnegie Mellon’s SiLK software and also supports the legacy flow-tools collector. Its tools divide the work among text reports in FlowViewer, graphical reports in FlowGrapher, and longer-term traffic monitoring in FlowMonitor. The site lists Netflow versions 5 and 9, including IPv6, and filters for address, port, interface, autonomous system, TOS, TCP flags, protocol, and next hop. Users can choose from over 30 reports and save reports and filters. FlowGrapher charts bits, flows, and packets per second over a selected period. FlowMonitor supplies RRD graphs for filtered traffic, with viewing periods from 24 hours to three years. Multiple dashboards can give groups such as Security and Operations distinct live views. Deployment is on a dedicated Unix server or virtual appliance, and the free software requires a Unix server. Paid services are also listed: custom support priced on request, billed per hour with a four-hour minimum; router configuration at $500, paid once; training at $500, paid once; and installation at $750, paid once.
For and against
For
- Free software plan costs nothing
- Offers over 30 reports
- Filters by address, port, protocol, and other fields
- Monitoring views span 24 hours to three years
Against
- Requires a Unix server
- Installation, training, and router configuration are paid services
- Custom support has a four-hour minimum
The verdict
FlowViewer brings reporting, graphing, and monitoring into one toolset for network flow analysis. Its Unix server requirement and separately priced support services are key deployment considerations.
Who it suits
FlowViewer suits teams that need to inspect network flow data through reports, graphs, and longer-term monitoring. It is aimed at organizations able to deploy it on a Unix server or virtual appliance.
Plans and prices
FlowViewer
Free software; requires a Unix server
Read 8 Oct 2026 · flowviewer.net
Custom Support
Minimum 4 hours
Read 8 Oct 2026 · flowviewer.net
FlowViewer Training
Training run-through; web conference using a live installation is suggested
Read 8 Oct 2026 · flowviewer.net
Router Netflow Config
Netflow configuration and troubleshooting until the stream reaches the collector
Read 8 Oct 2026 · flowviewer.net
FlowViewer Install
Full install of FlowViewer and SiLK on a Unix server
Read 8 Oct 2026 · flowviewer.net
On the record
- Architecture
- It provides a dynamic user interface to Carnegie Mellon's SiLK software and also supports the legacy flow-tools collector.flowviewer.net · read 8 Oct 2026
- Components
- The toolset includes FlowViewer for text reports, FlowGrapher for graphical reports, and FlowMonitor for long-term traffic monitoring.flowviewer.net · read 8 Oct 2026
- Contact
- The contact page lists Joe Loiacono and an address in Ellicott City, Maryland.flowviewer.net · read 8 Oct 2026
- Dashboards
- Multiple dashboards let groups such as Security and Operations focus on their own concerns on a live operational basis.flowviewer.net · read 8 Oct 2026
- Deployment
- FlowViewer can be installed on a dedicated Unix server or virtual appliance.flowviewer.net · read 8 Oct 2026
- Downloads
- The downloads page lists FlowViewer tar files and user guides for versions 4.5 and 4.6.flowviewer.net · read 8 Oct 2026
- Filtering
- FlowViewer supports filtering by address, port, interface, autonomous system, TOS, TCP flags, protocol, and next hop.flowviewer.net · read 8 Oct 2026
- Graphing
- FlowGrapher graphs bits per second, flows per second, and packets per second over a specified time period.flowviewer.net · read 8 Oct 2026
- Monitoring
- FlowMonitor provides RRD graphs for filtered traffic, with views covering periods from 24 hours to 3 years.flowviewer.net · read 8 Oct 2026
- Protocol support
- The site says Netflow versions 5 and 9 are supported, including IPv6.flowviewer.net · read 8 Oct 2026
- Purpose
- FlowViewer is free software for analyzing Netflow data exported from an organization's network devices.flowviewer.net · read 8 Oct 2026
- Reports
- FlowViewer offers over 30 reports and lets users save reports and filters.flowviewer.net · read 8 Oct 2026
- Support
- The maker offers installation, router Netflow configuration, training, and custom hourly support.flowviewer.net · read 8 Oct 2026
