If your want to measure your network throughput between your servers your may want to discover the power of the might iPerf.
iPerf work in client-server model, you will need to install the package on both servers, and run the server side in one host and client side in the other.
Install iPerf on both servers.
$ sudo apt install iperf -y
Server side is ip address 192.168.1.10, run the following command in server side.
$ sudo iperf -l 1M -w 4M -f M -s
Client side is 192.168.1.20, run the following command in client side.
$ sudo iperf -l 1M -w 4M -f M -t 60 -c 192.168.1.10
(Check this link to read more about iPerf.)