Free Netflow Analyzer For Cisco ((new)) Jun 2026

Granular, real-time forensics. ntopng is a web-based tool that feels like a high-end firewall dashboard. It builds a live, in-memory map of every conversation on your network.

The selection of a free NetFlow analyzer depends entirely on the scale of the Cisco environment and the technical proficiency of the administrator.

Developed by Cisco and now an industry standard (IPFIX), NetFlow is a technology embedded inside nearly every Cisco router and switch running IOS, XE, or XR. It is a metadata generator. It doesn't read the content of your packets (privacy intact), but it reads the conversation —the source, destination, port, type of service, and timestamp. free netflow analyzer for cisco

flow monitor NetFlow-Monitor record NetFlow-Record exporter NetFlow-Exporter cache timeout active 60

This report evaluates the top free NetFlow analyzers based on their feature sets, scalability, ease of management, and specific compatibility with Cisco IOS and IOS-XE. Granular, real-time forensics

This tells the router where to send the data (the IP of your Analyzer server).

You are looking at a black box.

flow record NetFlow-Record match ipv4 source address match ipv4 destination address match transport source-port match transport destination-port match ipv4 protocol collect counter bytes collect counter packets

If you need a solution, ntopng is widely considered the gold standard. The selection of a free NetFlow analyzer depends

When selecting a free tool for a Cisco environment, the following criteria were applied:

PRTG NetFlow Sensor is a free tool that allows you to monitor and analyze NetFlow data from your Cisco devices. The tool provides detailed traffic analysis, including top talkers, protocol breakdown, and packet size distribution. It also supports multiple NetFlow versions and provides customizable dashboards and alerts.