NetFlow Monitoring

Use PRTG for Detailed NetFlow Monitoring

NetFlow monitoring shows you:

  • where your bandwidth is used
  • who is using it
  • how it is being used
  • why it is being used

It lets you see which specific applications are being used and how the usage might affect your network. NetFlow monitoring is included in all PRTG Network Monitor licenses.

Cisco devices with NetFlow Support track the bandwidth usage of the network internally. The NetFlow protocol is supported by most Cisco routers and certain Cisco switches. These devices can be configured to send pre-aggregated data to the computer running a NetFlow monitor such as PRTG Network Monitor. Since the data is pre-aggregated, this is easier on the system than using the packet sniffer functionality. This makes NetFlow monitoring ideal for tracking bandwidth usage on high traffic networks.

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Configuring The NetFlow Monitor

Configure the NetFlow protocol on the router to send NetFlow packets to the computer running PRTG Network Monitor:

  • Configure a NetFlow Sensor in PRTG (NetFlow Sensors are included in all PRTG licenses, even in the Freeware)
  • Create one new NetFlow Sensor for each IP or protocol to be monitored, and apply a filter based on the IP or protocol for each item you want to monitor
  • Or: If you do not need long term accounting data for each PC and only want to know the current and recent traffic by IP or protocol, you can  create just one NetFlow Sensor and enable the Toplist feature based on IP or protocol.

Further information on setting up NetFlow Sensors for NetFlow monitoring can be found in the online manual.

Start Using PRTG for NetFlow Monitoring

You can test our NetFlow monitor with the 30-Day-Trial-Edition of PRTG Network Monitor, which supports unlimited sensors. The Commercial Editions are required if you want to monitor more than 100 sensors after the 30 day trial period. All PRTG licenses, including the freeware, allow you to use NetFlow. The number of NetFlow sensors is only limited by number of sensors included in your license.

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