The of your routers or switches (Cisco, Juniper, Ubiquiti?)
Only captures and displays data in real-time; lacks historical data storage and advanced reporting.
Connection terminated.
The you want to run the monitor on (Windows, Linux?) The size of your network (How many devices or interfaces?)
Admins needing a quick, temporary tool to diagnose immediate bandwidth issues on a single interface. 2. ntopng (Community Edition) free netflow monitor
Advanced security forensics, highly detailed flow data visualization.
The security investigation tools. You can drill from “High UDP traffic” straight into a flow grid, apply a filter for “Deny” actions, and pivot to a geo-map. No other free tool matches its threat-hunting workflow. The of your routers or switches (Cisco, Juniper, Ubiquiti
Extremely detailed visual data, supports multiple flow protocols (NetFlow, sFlow, IPFIX), open-source core.
Your monitor is useless without data. Here’s a generic Cisco-style config (check your vendor’s syntax): You can drill from “High UDP traffic” straight
Have a favorite free monitor I missed? Let me know in the comments — always looking to update the list.