Netflow Analyzer Open Source |link| 🔥

A regional university with 5,000 students deployed NfSen on a VM (2 vCPU, 4 GB RAM). Exported NetFlow v9 from a Cisco 4500 switch. Over 30 days, NfDump stored 1.2 billion flows using 40 GB of disk. Administrators identified a P2P traffic anomaly causing 40% bandwidth saturation within 15 minutes of query. The solution succeeded due to low overhead and fast binary search.

Router(config)# interface GigabitEthernet0/1 Router(config-if)# ip flow monitor FLOW-MONITOR-1 input Router(config-if)# ip flow monitor FLOW-MONITOR-1 output netflow analyzer open source

If you are new to network analysis, start with for its robust history and standard adherence, or ntopng if you prefer a "plug-and-play" experience with a modern look. For those already running an ELK stack, ElastiFlow is the logical choice. A regional university with 5,000 students deployed NfSen