https://www.speedtest.net/ is great tool for learning about your internet connection speed.
If you are in a local environment, how do you figure out available bandwidth? Use cases: copying large files from one internal machine to another internal machine? Or running a local streaming service.
You can usehttps://iperf.fr/. You need two machines capable or running iperf3.
To test WiFi speed, at least one of connected via Wi-Fi. Both can also be connected by WiFi (worst case). My recommendation is to test in both cases.
iperf3 on both machines A and B.iperf3 -s on machine A or use iperf3 -s -D to keep it running as daemon. Handy if you plan to test periodically.iperf3 -c <ip_of_A> on machine B.Here is sample output at my home when both devices are connected by WiFi.
On a machine with IP 191.168.1.142, I run iperf3 in server mode.
$ iperf3 -s -D
Then on second machine
$ iperf3 -c 192.168.1.142
Connecting to host 192.168.1.142, port 5201
[ 5] local 192.168.1.131 port 38888 connected to 192.168.1.142 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 12.8 MBytes 107 Mbits/sec 0 124 KBytes
[ 5] 1.00-2.00 sec 13.2 MBytes 111 Mbits/sec 0 124 KBytes
[ 5] 2.00-3.00 sec 13.1 MBytes 110 Mbits/sec 0 124 KBytes
[ 5] 3.00-4.00 sec 13.6 MBytes 114 Mbits/sec 0 124 KBytes
[ 5] 4.00-5.00 sec 13.0 MBytes 109 Mbits/sec 0 124 KBytes
[ 5] 5.00-6.00 sec 12.6 MBytes 106 Mbits/sec 0 124 KBytes
[ 5] 6.00-7.00 sec 11.2 MBytes 94.4 Mbits/sec 0 124 KBytes
[ 5] 7.00-8.00 sec 10.4 MBytes 87.0 Mbits/sec 0 124 KBytes
[ 5] 8.00-9.00 sec 13.0 MBytes 109 Mbits/sec 0 124 KBytes
[ 5] 9.00-10.00 sec 13.1 MBytes 110 Mbits/sec 0 124 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 126 MBytes 106 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 126 MBytes 105 Mbits/sec receiver
iperf Done.
Here we go. I have some idea how fast I can transfer data between two computers on my local network.