Linux – using Iperf3 to test upload and download

iperflinux

How to use Ipfer3 to test upload and download speed or in other words which data of the output given below represents upload and download speed ?

Iperf3 output

Iperf3 output

Best Answer

The iperf client initiates a connection to an iperf server, and the default test is the upload speed:

$ iperf3 -c la.speedtest.clouvider.net -p 5209
Connecting to host la.speedtest.clouvider.net, port 5209

when you use the -R switch, it downloads from the server. note the 3rd line:

$ iperf3 -c la.speedtest.clouvider.net -p 5209 -R
Connecting to host la.speedtest.clouvider.net, port 5209
Reverse mode, remote host la.speedtest.clouvider.net is sending
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