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Old stuff - but a goodie - wiki markup here...

====== Iperf3 ======

While Ookla (speedtest.net) is a great resource when out on public networks, I'd recommend having something on your LAN for more consistent and thorough results.

Multi-platform support is key for a tool like this.

We've already outlined how to install Speedtest-Mini on the server, but let's dig a bit deeper with iperf3

Here is a brief step-by-step on how to set up the server (ubuntu) and clients (Android,iOS,OSX,Windows,Linux).

**Installing iPerf3**

Ubuntu 16.04LTS

sudo apt install iperf3

on Macs - using Homebrew

brew install iperf3

Windows - download the compiled version for windows at http://iperf.fr

IOS - Included as part of the free he.net app from the iOS app store

Android - Check GooglePlay for apps there

Once installed, verify you've got the correct version with "iperf3 -v". It should output the following, you want to ensure that your client/server are the same version (or close to it):

$ iperf3 -v
iperf 3.0.11

If you're familiar with iperf2, many of the command-line switches are the same. For a list of the different options, just run iperf3 without any switches.

Run IPerf3 in server mode with:

$ iperf3 -s

All CLI clients can be run in "client" or "server" mode. For a quick test from Windows, OSX or Linux CLI run:

iperf3 -c <server_ip>

For example;

$ iperf3 -c
Connecting to host, port 5201
[ 4] local port 53868 connected to port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 112 MBytes 943 Mbits/sec
[ 4] 1.00-2.00 sec 112 MBytes 940 Mbits/sec
[ 4] 2.00-3.00 sec 112 MBytes 941 Mbits/sec
[ 4] 3.00-4.00 sec 111 MBytes 931 Mbits/sec
[ 4] 4.00-5.00 sec 112 MBytes 941 Mbits/sec
[ 4] 5.00-6.00 sec 112 MBytes 940 Mbits/sec
[ 4] 6.00-7.00 sec 112 MBytes 940 Mbits/sec
[ 4] 7.00-8.00 sec 112 MBytes 940 Mbits/sec
[ 4] 8.00-9.00 sec 112 MBytes 940 Mbits/sec
[ 4] 9.00-10.00 sec 112 MBytes 940 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 1.09 GBytes 940 Mbits/sec sender
[ 4] 0.00-10.00 sec 1.09 GBytes 939 Mbits/sec receiver

iperf Done.


You can see the results on stdout (ie on your terminal), at 1 second intervals ("-i" option). Again, to see the different options available just run iperf3 wihtout any switches.

===== Features =====

Some features I like about iperf3:

the server will, by default, only run a test with a single client at a time. If you try to run two tests simultaneously, you'll see a message like the following:

error: The server is busy running a test. try again later.

Another example, using a "reverse" test (from server to client):

iperf3 -c <server_ip> -i1 -R

This can be really useful when testing WiFi and VPN. This was not possible with speedtest-mini. Having asymmetric throughput issues could tell you a lot.

===== Getting more from from iPerf3 =====

Test for 5 seconds and use TCP - TCP is the default for iPerf

iperf3 -c <server_ip> -t 5

Don't include the first 2 seconds in the BW calculator to allow TCP slow start to finish

iperf3 -c <server_ip> -O 2

Label the test - This is useful when testing in several different rooms or to compare a 2.4Ghz connection to a 5Ghz connection

iperf3 -c <server_ip> -T 2.4GHz

Test using more than one stream -- Use 5 parallel streams - I have found this to be a good number to use

iperf3 -c <server_ip> -P 5 -T 2.4GHz

Reverse the test direction - This is useful when you are testing a VPN connection and have an asymmetric connection - 10Mbps download and 2Mbps Upload for example. You can run the test in each direction to verify.

iperf3 -c <server_ip> -P 5 -T VPNtoServer
iperf3 -c <server_ip> -P 5 -R -T VPNfromServer

Test using UDP

iperf3 -c <server_ip> -u

===== Install iperf3 as a service =====

After installing iperf3 from apt

Create a user iperf which will be used to run the iperf3 service.

$ sudo useradd iperf -s /sbin/nologin

Create the following file:

sudo nano /etc/systemd/system/iperf3.service

Put in the following contents and save the file:
Description=iperf3 Service

ExecStart=/usr/bin/iperf3 -s



Start the iperf3 service:

$ sudo systemctl start iperf3

Check the status:

$ sudo systemctl status iperf3

Should get something like below;

iperf3.service - iperf3 Service
Loaded: loaded (/etc/systemd/system/iperf3.service; disabled)
Active: active (running) since Mon 2014-12-08 13:43:49 EST; 18s ago
Main PID: 32657 (iperf3)
CGroup: /system.slice/iperf3.service
└─32657 /usr/bin/iperf3 -s

Dec 08 13:43:49 testbox systemd[1]: Started iperf3 Service.

Stop the iperf3 service:

$ sudo systemctl stop iperf3

Start the service at boot:

$ sudo systemctl enable iperf3

Disable the service at boot:

$ sudo systemctl disable iperf3

===== More Info =====


Public iperf3 servers - https://iperf.fr/iperf-servers.php
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