Plixer’s Scrutinizer is the gold standard. The free version is limited to and keeps data for 5 hours of raw detail (aggregated views go back 30 days). For most SMBs and labs, 10k fps is huge.
It runs best on a dedicated VM (Windows or Linux). The interface is powerful but has a 2010-era learning curve. 2. ntopng (Community Edition) Best for: Real-time visibility and edge monitoring. free netflow monitor