This tool has to configure server side and client side to complete a test. It can test from client side to server side , also can test from both direction.
1. Download iperf 3
The main download site is from https://iperf.fr/iperf-download.php.
2. Start it as server
Running command 'iperf -s' from command line as iperf server (ip address 100.99.136.66).C:\Tools>iperf -s
------------------------------------------------------------Server listening on TCP port 5001TCP window size: 8.00 KByte (default)------------------------------------------------------------[188] local 100.99.136.66 port 5001 connected with 100.94.200.14 port 48410[ ID] Interval Transfer Bandwidth[188] 0.0-10.0 sec 121 MBytes 101 Mbits/sec