iPerf How to Test Bandwidth and Throughput

This video shows you how to use iPerf to test network bandwidth and the throughput on your network.
Written instructions with more examples:
networkverge.com/iperf-test-n...
iPerf download link:
iperf.fr/iperf-download.php
In this video I use two Windows 10 computers; one acts as the client and the other acts as the iPerf server. iPerf is also supported on Linux and MacOS x.
The steps to using the iPerf command are very easy.
Step 1: Download and install iPerf.
Step2: Enable the iPerf server with the iperf3 -s command.
Step 3: Start the client with iperf3 -c "Server-IP" command.
iPerf was designed as a tool for tuning network performance but I think it works great as a tool for testing throughput and verifying bandwidth usage.
For more networking tutorials check out my site:
networkverge.com

[@davidrose2899]

Great explanation, thanks!

[@nousername9115]

If you add -P (uppercase P)for parallel streams and run say, 10 at -b 0 you should see a lot closer to 10g. This is for many reasons, but mostly because this uses more pcie lanes. You can also run the server and client sides in both directions using a second iperf3 instance on both machines.

[@weweresubtle]

Very helpful. thanks.

[@erikasantos2595]

Simple and to the point! Great video!

[@lands1459]

how do i make it output continuously on linux? it only outputs once for me

[@hishamamin5266]

perfect , show the other useful options in iperf , can we test udp and test with certain frame sizes like 64byte.

[@GameOverAus]

my 10Gb NIC is only getting 2gb one way and if i try the other PC as the host it cant even connect to the other PC yet i can access it with the same IP via explorer

[@maverick_jl]

Tried getting to your website for the Written instructions, but it's not connecting. Great video BTW!!

[@tabeshforoughi1380]

Hi, Thanks for your video. I have a problem with Client connecting to the server. The iperf times out from the client. Would you kindly advise please. Regards Tab

[@nousername9115]

Likely firewall related on the server side. Be sure to allow the configured ports through the firewall

[@harrystowcrath4842]

How do you know you server IP address ?

[@tango_gru]

Hi there
This is just doing One way traffic test. Shouldnt it be doing a check on send and receive ? Plus there is no latency details ??

[@jannienortje8347]

Test is unaccurate due to the fact that its not sending and receiving on the server side. So open the network monitor on the server and as per your video 0mbps on the servers sending side. Yes you can do a a normal test and a -R but its still not at the same time which does not simulate the real bandwidth test.
I usually do a iperf3 - c (ip) -P 10 t 120 -V and a -R. Running a --bidir does not work. UDP unaccurate too.

[@david_allen1]

I suggest changing the title of your video to include “on Windows” so it’s clear that it’s not a general tutorial for multiple operating systems.

[@jannienortje8347]

It is for multiple systems. It works the same on mac and UX

[@anonymoususer6786]

You need to edit your video, this was poorly done

[@dean4781]

How about you share your great video showing how this is done. Video was perfect and taught me what I needed.

[@neumei626]

Anonymousdick6786, you need to edit your comment, it was poorly written and unspecific.