Iperf(linux) and jperf(windows) does generate traffic flows. You simply set up sender/receiver and it'll generate traffic load. It can generate 10gig line rate unicast flows but multicast replication is limited because it is software based. Iperf/jperf however, is not as flexible or anywhere as feature rich and powerful as some of the other hardware solutions as mentioned earlier - ex: ixia, spirent etc. -Jia ------Original Message------ From: Erik Bais To: 'Naiden Dimitrov' To: 'George Jones' Cc: nanog@nanog.org Subject: RE: flow generating tool Sent: Sep 26, 2011 9:03 AM Perhaps not a tool as in software, but clearly something that you might want to have a look at : Ixia and Spirent devices ... Those are mostly used for applications like generating different kind of traffic. Erik Bais