First of all, make sure you have iperf installed on both hosts.
If you haven’t, then use the following command to install it. I will be using Ubuntu flavour linux for demonstration.
apt-get install iperf
Pick one host as Server, one host as Client.
On the server issue the following command
iperf -s
One the Client, issue the following command
You can find the Server_IP by using ifconfig -a on your host
iperf -c Server_IP
See the following example for more info
Server
root@london:~# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.1.100 port 5001 connected with 192.168.1.50 port 54273
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 112 MBytes 94.0 Mbits/sec
Client
WS ~ # iperf -c 192.168.1.100
------------------------------------------------------------
Client connecting to 192.168.1.100, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.1.50 port 54273 connected with 192.168.1.100 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 112 MBytes 94.1 Mbits/sec