Use iperf to diagnose Linux network speed | Top Docs

iPerf is a command-line tool used to measure the maximum network throughput a server can handle. It is particularly useful when experiencing network speed issues, as you can use iPerf to determine which server is unable to reach maximum throughput.
Chapters:
0:00 - Intro
1:05 - Installing iperf
2:25 - Running iperf
3:42 - Testing UDP Connections
4:20 - Bidirectional Tests
6:44 - Outro
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Product: Linode, Linux Commands, iperf; Jay LaCroix;

[@rftech1608]

thank you I enjoyed the video it was the explanation I was looking to run some test with.

[@MrTon4eff]

I'm getting: "connect failed: Connection refused" in both directions on Debian 11 servers... :/ Maybe the firewall is blocking the port?

[@AkamaiDeveloper]

This thread might help with your issue serverfault.com/questions/280961/iperf-connect-failed-connection-refused

[@MrTon4eff]

​@@AkamaiDeveloper Thank you! Yes, it was iperf version mismatch... Now everything works fine with iperf3.

[@ruixue6955]

3:42 test UDP speed

[@nehajain2974]

I have installed iperf3 on my Linux machine and on my windows machine. Used iperf3 on Linux as server and windows as client. Getting only 37Mbits/sec. My router is gigabit. What seems to be the problem??? Please help