FlowScan - Network Traffic Flow Visualization and Reporting Tool

FlowScan analyzes and reports on Internet Protocol (IP) flow data exported by routers. 
Consisting of Perl scripts and modules, FlowScan binds together 
 (1) a flow collection engine (a patched version of cflowd), 
 (2) a high performance database (Round Robin Database - RRD), and 
 (3) a visualization tool (RRDtool). 
FlowScan produces graph images that provide a continuous, near real-time view of the network border traffic.