iperf -c 10.2.0.4 -P 4
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Client connecting to 10.2.0.4, TCP port 5001
TCP window size: 92.9 KByte (default)
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[  3] local 10.2.0.3 port 33491 connected with 10.2.0.4 port 5001
[  4] local 10.2.0.3 port 33489 connected with 10.2.0.4 port 5001
[  5] local 10.2.0.3 port 33490 connected with 10.2.0.4 port 5001
[  6] local 10.2.0.3 port 33492 connected with 10.2.0.4 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.14 GBytes   981 Mbits/sec
[  4]  0.0-10.0 sec  1.14 GBytes   980 Mbits/sec
[  5]  0.0-10.0 sec  1.15 GBytes   987 Mbits/sec
[  6]  0.0-10.0 sec  1.15 GBytes   987 Mbits/sec
[SUM]  0.0-10.0 sec  4.58 GBytes  3.94 Gbits/sec