donald@R2-D3:~$ iperf -c 192.168.51.115

------------------------------------------------------------

Client connecting to 192.168.51.115, TCP port 5001

TCP window size: 45.0 KByte (default)

------------------------------------------------------------

[  3] local 192.168.100.115 port 53340 connected with 192.168.51.115 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0-10.2 sec  9.75 MBytes  8.02 Mbits/sec

donald@R2-D3:~$ iperf -s

------------------------------------------------------------

Server listening on TCP port 5001

TCP window size: 85.3 KByte (default)

------------------------------------------------------------

[  4] local 192.168.100.115 port 5001 connected with 192.168.51.115 port 37054

[ ID] Interval       Transfer     Bandwidth

[  4]  0.0-10.6 sec  5.50 MBytes  4.34 Mbits/sec

ubuntu@ubuntu_pie:~$ iperf -s

------------------------------------------------------------

Server listening on TCP port 5001

TCP window size: 85.3 KByte (default)

------------------------------------------------------------

[  4] local 192.168.51.115 port 5001 connected with 192.168.100.115 port 53340

[ ID] Interval       Transfer     Bandwidth

[  4]  0.0-10.4 sec  9.75 MBytes  7.85 Mbits/sec

ubuntu@ubuntu_pie:~$ iperf -c 192.168.100.115

------------------------------------------------------------

Client connecting to 192.168.100.115, TCP port 5001

TCP window size: 43.8 KByte (default)

------------------------------------------------------------

[  3] local 192.168.51.115 port 37054 connected with 192.168.100.115 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0-10.2 sec  5.50 MBytes  4.53 Mbits/sec