Install an iperf3 server on fedora to test your network

On the box you are going to use as a server

sudo dnf install iperf3

open port on firewalld:

sudo firewall-cmd --add-port=5201/tcp --permanent
sudo firewall-cmd --reload

run a test to make sure this works by starting iperf on the  server

sudo iperf3 -s

Now – run iperf3 on a client machine to make sure it connects

iperf3 -c ip.address.of.server

Now we are going to set up iperf3 as a service that will automatically start when the server is booted

Create user for service without login permissions

sudo adduser iperf -s /sbin/nologin

Make sure /sbin/nologin is in /etc/shells

sudo vim /etc/shells

(if the line 
/sbin/nologin
is not in this file - add it)

Create the service file

sudo vim /usr/lib/systemd/system/iperf3.service

Insert the following into the file

[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

Reload systemctl

sudo systemctl daemon-reload

Start and enable the service

sudo systemctl enable --now iperf3

Confirm it is running

sudo systemctl status iperf3

You should see something like this:

● iperf3.service – iperf3 Service
Loaded: loaded (/usr/lib/systemd/system/iperf3.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2016-04-21 16:51:47 EDT; 14min ago
Main PID: 27450 (iperf3)
Memory: 100.0K
CPU: 499ms
CGroup: /system.slice/iperf3.service
└─27450 /usr/bin/iperf3 -s

Apr 21 16:51:47 duncan.local systemd[1]: Started iperf3 Service.
Apr 21 16:51:47 duncan.local systemd[1]: Starting iperf3 Service…

Tested on Fedora 42