does not show up in "ps ax | grep iperf" but still tests and responds, but with bogus data:
brunis@Boonto:~$ iperf -c 10.0.2.21
------------------------------------------------------------
Client connecting to 10.0.2.21, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[ 3] local 10.0.2.26 port 51508 connected with 10.0.2.21 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 0.00 � ��s 14748330934774687744 Bytes/sec