iPerf3 servers will only allow one iPerf connection at a time. Multiple tests at the same time is not supported. If a test is in progress, the following message is displayed: "iperf3: error - the server is busy running a test. try again later"

To add / remove a public iPerf3 server, please report them to @lafibreinfo

iPerf3 not allow multiple tests to a server => it is necessary to start several iPerf processes for not having the message iperf3: error - the server is busy running a test. try again later Systemd script to start 41 iPerf3 server (port 9200 to port 9240). sudo adduser iperf --disabled-login --gecos iperf sudo nano /etc/systemd/system/[email protected]

The "Restart = always" allows to restart iperf3 after one hour (RuntimeMaxSec = 3600) to limit the cases of no response or when the iperf3 server has ended abruptly.

sudo systemctl daemon-reload To activate iperf3 when the server starts up: for p in $(seq 9200 9240); do sudo systemctl enable iperf3-server@$p ; done

sudo reboot

To view the status and logs of iPerf3 : sudo systemctl status iperf3-server@* sudo journalctl -u iperf3-server@*

To disable iperf3 when starting the server : for p in $(seq 9200 9240); do sudo systemctl disable iperf3-server@$p ; done

NetEm (already enabled in the Linux kernel) provides Network Emulation functionality for testing protocols by emulating the properties of wide area networks. To simulate an additional latency of 80 ms, just type sudo tc qdisc add dev eth0 root netem delay 80ms It just adds a fixed amount of delay to all packets going out of the local Ethernet. To stop the additional latency, just type sudo tc qdisc change dev eth0 root netem delay 0ms Lines to add to the file /etc/rc.local before exit 0, to add 40ms of latency :

Note: If your network interface is not eth0, replace eth0 with the name of your network interface