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How to test the network speed/throughput between two Linux servers

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You can test the network speed or throughput between two Linux servers using the iperf tool. Here's how to do it:

  1. Install iperf on both servers:
sudo apt install iperf (on Debian/Ubuntu)
or 
sudo yum install iperf (on CentOS/Red Hat)
  1. On one of the servers, start iperf in server mode:
iperf -s
  1. On the other server, start iperf in client mode and specify the IP address of the first server:
iperf -c <server-IP>

The output will show the network speed or throughput between the two servers, including the amount of data transferred, the transfer rate, and other relevant information. You can use the -t option to specify the duration of the test.

Note: You can also use the iperf3 tool, which is an updated version of iperf that includes new features and improvements. The usage is similar to iperf.