IT/Software/Command Line Applications/iperf3

Install

sudo apt install iperf3

Usage

Server

This is the computer that will listen for requests for speed checks.

On the server you need to start listening

iperf3 -s

Server Options

-1 is great as it allows for one check from a remote client and then exits the program

Client

This is the computer that will try to dial into the server to test their communication speed

On the client you need to send the request

iperf3 -c ipAddressOfServer

NOTE: If the server is on a dynamic ip and or behind a router that does not have the port forwarded then you will need zerotier setup to get to the listening computer.

Client Options

-V tell you more

-t 5 will only check five times. Usually enough

For example: iperf3 -c 10.243.204.189 -V -t 5

-f M will report in Megabytes. For me still a bit more readable.