This is Iperf v2.0.0, a tool for measuring Internet bandwidth performance. See the doc directory for more documentation. Briefly: ./configure -- configure for your machine make -- compile Iperf make install -- install Iperf, if desired iperf -s (on machine "foo.bar.edu") iperf -c foo.bar.edu (on some other machine) iperf -h (for help screen) iperf -v (for version information) Copyright 1999, 2000, 2001, 2002, 2003, 2004 The Board of Trustees of the University of Illinois All rights reserved See UI License (doc/ui_license.html) for complete details. SSM IGMP feature ---------------- You can try this feature like this: . on a machine, run: iperf -s -u -B 224.0.67.67 -i 1 -O 192.168.0.1 -X eth0 . on the 192.168.0.1 machine, run: iperf -c 224.0.67.67 -u --ttl 5 -t 5