Verifying the interface speed configuration

To verify the max speed for an interface, use the below command which will show the speed.

ethtool eth0

To modify the speed of the interface use below command

ethtool --speed 1000 eth0

**Number above is in Mb/s

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Other Method:

Install iperf on two nodes using apt-get or yum.

On the first node run, 

command: iperf -s -f M

Then on the second node

command: iperf -c x.x.x.x -f M

Here x.x.x.x is the ip address of first node where the iperf is running. This will show a test of transfer speed between the two nodes.

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