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test vpn bandwidth and speed with iperf


This article explains how to use a free utility called iPerf to test the speed of a VPN connection. In this example I am running iPerf on windows but there are other versions available (i.e. Linux).

  2. Put a copy on 2 computers with 1 either side of the VPN. In this example I have put in the c:\triangle folder
  3. On the “server” PC open a cmd prompt and navigate to the folder containing iperf. Note on computers running Win7 or Win2008 I recommend running the cmd prompt in elevated mode.
  4. Run the command iperf –s


  5. On the “client” PC open a cmd prompt and again navigate to the folder containing iperf.
  6. Run the command iperf –c


  7. After a short while the estimated bandwidth is displayed.
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