iperf -c 192.168.1.76 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.1.76, TCP port 5001
TCP window size: 35.1 KByte (default)
------------------------------------------------------------
[  7] local 192.168.1.81 port 4992 connected with 192.168.1.76 port 5001
[  6] local 192.168.1.81 port 5001 connected with 192.168.1.76 port 47997
[  7]  0.0-10.0 sec  1.54 MBytes  1.29 Mbits/sec
[  6]  0.0- 9.9 sec    111 MBytes  94.2 Mbits/sec

iperf -c 192.168.1.81 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.1.81, TCP port 5001
TCP window size: 26.1 KByte (default)
------------------------------------------------------------
[  5] local 192.168.1.76 port 60148 connected with 192.168.1.81 port 5001
[  4] local 192.168.1.76 port 5001 connected with 192.168.1.81 port 4032
[  5]  0.0-10.0 sec    109 MBytes  91.4 Mbits/sec
[  4]  0.0-10.0 sec  3.38 MBytes  2.83 Mbits/sec