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If you want to check between two machine NIC speed the follow the below steps:-

Install nc and pv

$ sudo yum install pv

Once you have nc and pv installed, it’s really simple. On one machine, run the following command:

$ nc -ulp 5000 > /dev/null

On the second machine run the following command (you need the IP address of the first machine):

$ pv < /dev/zero | nc -u 192.168.0.174 5000

And you should get some output with a little <=> sign moving across the screen that resembles this (static):

1.15GB 0:00:19 [ 218MB/s] [ <=> ]

This will show you the number of MB/s the connection is averaging; if you watch if for a bit, you can get an idea of where things stand. Here are some of the results I got between my RedHat, Fedora and Ubuntu Machines:

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