Free Netflow Collector [upd] -

We resurrected NfSen for a legacy "quick-look" interface, but the real magic was Grafana . We connected Grafana to ClickHouse using a custom plugin. Suddenly, we had real-time dashboards: Sankey diagrams of traffic between subnets, pie charts of egress cost by customer ID, and a terrifying heatmap of port scans.

The main trade-off is history; the free version only keeps 24 hours of data . free netflow collector

This was the secret weapon. We abandoned PostgreSQL. ClickHouse is a columnar database built for analytics. It chews through billions of NetFlow records like a woodchipper. Sarah configured an aggregating merge tree to pre-calculate top talkers, protocols, and ASNs. We resurrected NfSen for a legacy "quick-look" interface,

Visibility is everything in network management. Without it, you’re just guessing why the bandwidth is spiking or where that suspicious traffic is coming from. While enterprise-grade solutions exist, you can gain deep insights using a . The main trade-off is history; the free version