How to test network performance between two devices?

Testing network performance is essential to ensure reliable and efficient data transfer between nodes e.g. during data migrations.

iperf command

The iperf command can be used to test and measure the network bandwidth between two nodes.

# network performance test where the client (actual node) sends data to the server at IP address 10.120.2.50
# so bandwidth measurement direction is client--to-->server
iperf -c 10.120.2.50

# network performance test where the server at IP address 10.120.2.50, sends data to the client (actual node) 
# so bandwidth measurement direction is server--to-->client
iperf --reverse -c 10.120.2.50

Check out the iperf repository on GitHub for more advanced options: https://github.com/esnet/iperf