How to check network speed ?

Install iperf to server and client.

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server # iperf -s -f a
client # iperf -c server

or file transfer

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server # iperf -s -f a
client # dd if=/dev/urandom of=/tmp/file_1GB bs=4M count=256
client # iperf -c server -f a -F /tmp/file_1GB -l 1GB