Bandwidth tests with iperf3
If you ever come to the need of a simple bandwidth test for your server or client, you can setup a bandwidth test via iperf3.
For starting an iperf3 server, just use iperf3 -s:
❯ iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 139.174.228.245, port 33133
[ 5] local 78.46.124.83 port 5201 connected to 139.174.228.245 port 21516
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 12.1 MBytes 101 Mbits/sec 354 567 KBytes
[ 5] 1.00-2.00 sec 10.0 MBytes 83.9 Mbits/sec 209 993 KBytes
[ 5] 2.00-3.00 sec 8.75 MBytes 73.4 Mbits/sec 58 913 KBytes
[ 5] 3.00-4.00 sec 7.50 MBytes 62.9 Mbits/sec 156 1.18 MBytes
[ 5] 4.00-5.00 sec 11.2 MBytes 94.4 Mbits/sec 144 781 KBytes
[ 5] 5.00-6.00 sec 7.50 MBytes 62.8 Mbits/sec 72 987 KBytes
[ 5] 6.00-7.00 sec 7.50 MBytes 63.0 Mbits/sec 50 583 KBytes
[ 5] 7.00-8.00 sec 3.75 MBytes 31.5 Mbits/sec 0 662 KBytes
[ 5] 8.00-9.00 sec 3.75 MBytes 31.5 Mbits/sec 5 351 KBytes
[ 5] 9.00-10.00 sec 6.25 MBytes 52.4 Mbits/sec 49 885 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.08 sec 78.3 MBytes 65.2 Mbits/sec 1097 sender
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Server listening on 5201
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^Ciperf3: interrupt - the server has terminated
Now you can test your client against your server via iperf3 -R -c <hostname>,
where -R means reverse mode (the server sends data to your client). If you
want to test the opposite way, just use iperf3 -c <hostname> or iperf3 --bidir -c <hostname> for a bidirectional connection:
❯ iperf3 -R -c kurisu
Connecting to host kurisu, port 5201
Reverse mode, remote host kurisu is sending
[ 5] local 192.168.0.103 port 55182 connected to 78.46.124.83 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 8.59 MBytes 72.0 Mbits/sec
[ 5] 1.00-2.00 sec 11.0 MBytes 92.1 Mbits/sec
[ 5] 2.00-3.00 sec 8.23 MBytes 69.0 Mbits/sec
[ 5] 3.00-4.00 sec 8.23 MBytes 69.1 Mbits/sec
[ 5] 4.00-5.00 sec 10.1 MBytes 84.5 Mbits/sec
[ 5] 5.00-6.00 sec 7.65 MBytes 64.2 Mbits/sec
[ 5] 6.00-7.00 sec 7.01 MBytes 58.8 Mbits/sec
[ 5] 7.00-8.00 sec 4.60 MBytes 38.6 Mbits/sec
[ 5] 8.00-9.00 sec 4.18 MBytes 35.1 Mbits/sec
[ 5] 9.00-10.00 sec 5.96 MBytes 50.0 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.08 sec 78.3 MBytes 65.2 Mbits/sec 1097 sender
[ 5] 0.00-10.00 sec 75.5 MBytes 63.3 Mbits/sec receiver
iperf Done.