iperf / jperf

iperf:
https://iperf.fr/iperf-download.php (Windows)
https://www.neowin.net/forum/topic/1234695-iperf-34-windows-build/ (Windows)
yum -y install iperf3 (Linux)

jperf on Windows (with GUI):
https://sourceforge.net/projects/iperf/files/jperf/jperf%202.0.0/

iperf3 for Amazon Linux 2:

#!/bin/bash
	sudo yum update -y
	sudo yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
	sudo yum --enablerepo=epel install -y iperf iperf3
	exit 0

man page:
https://www.mankier.com/1/iperf3

[ec2-user@ip ~]$ wget https://install.speedtest.net/app/cli/ookla-speedtest-1.0.0-x86_64-linux.tgz

[ec2-user@ip ~]$ ./speedtest

   Speedtest by Ookla

     Server: Telstra - Sydney (id = 2629)

        ISP: Amazon

    Latency:     0.88 ms   (0.01 ms jitter)

   Download:  8683.15 Mbps (data used: 10.7 GB)

     Upload:  4789.32 Mbps (data used: 4.1 GB)

Packet Loss:     0.0%