Test Your Connection Speed with iperf

Install/Download iperf

First, Download iperf3 for your operating system from your operating systems package manager or download pre-compiled generic binaries here.

Debian-Based

apt-get install iperf3

RHEL-Based

yum install iperf3

Fedora 25+: dnf install iperf3

Windows

Download the iperf3 binary zip, unzip to a known location and open a command prompt in the folder where iperf3.exe is located.

Upload Test

Perform tests with the following settings, replacing SERVER with the iperf server to which you are testing.

UDP Test
iperf3 -c SERVER -p 5201 -ub 1G

(change 1G to your expected link speed. e.g. 10M for 10Mbps, 500M for 500Mbps or 1G for 1Gbps)

TCP Test
iperf3 -c SERVER -p 5201 -P 8 -l 1M

Dowload Test

UDP Test
iperf3 -c SERVER -p 5201 -ub 1G -R

(change 1G to your expected link speed. e.g. 10M for 10Mbps, 500M for 500Mbps or 1G for 1Gbps)

TCP Test
iperf3 -c SERVER -p 5201 -P 8 -l 1M -R

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