What's new

iperf3 fun stuff

  • SNBForums Code of Conduct

    SNBForums is a community for everyone, no matter what their level of experience.

    Please be tolerant and patient of others, especially newcomers. We are all here to share and learn!

    The rules are simple: Be patient, be nice, be helpful or be gone!

sfx2000

Part of the Furniture
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;

<code>
$ iperf3 -c 192.168.1.20
Connecting to host 192.168.1.20, port 5201
[ 4] local 192.168.1.100 port 53868 connected to 192.168.1.20 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.

</code>

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:
<code>
[Unit]
Description=iperf3 Service
After=network.target

[Service]
Type=simple
User=iperf
ExecStart=/usr/bin/iperf3 -s
Restart=on-abort


[Install]
WantedBy=multi-user.target
</code>

Done.

Start the iperf3 service:

$ sudo systemctl start iperf3

Check the status:

$ sudo systemctl status iperf3

Should get something like below;

<code>
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.
</code>

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 =====


https://fasterdata.es.net/performance-testing/network-troubleshooting-tools/iperf-and-iperf3/

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

Similar threads

Latest threads

Support SNBForums w/ Amazon

If you'd like to support SNBForums, just use this link and buy anything on Amazon. Thanks!

Sign Up For SNBForums Daily Digest

Get an update of what's new every day delivered to your mailbox. Sign up here!

Staff online

Top