Iperf works really well: http://dast.nlanr.net/Projects/Iperf/ It will do tcp/udp/multicast; you can pick the rate on the udp side and the client/server architecture lets you measure jitter, out of order packets, loss, etc. So you could load up a fixed rate of udp and then produce your burst using a second copy, etc. to see what happens. David

-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Dan Mahoney, System Admin Sent: Friday, June 03, 2005 1:49 PM To: nanog@merit.edu Subject: Load Testing Util

Hey all,

Does anyone know of a (preferably opensource) tool that can generate network loads of specific protocols and/or levels (for example, if I wanted to see how much loss I got on a 1 meg spike, over time). I'm hopefully looking for something client/server so I'm not necessarily dependent on reply packets to measure the thoroughput.

If anyone has any ideas, I'd love to hear them. Privately if you like, as I realize the potential for misuse of such things.

-Dan

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--------Dan Mahoney-------- Techie, Sysadmin, WebGeek Gushi on efnet/undernet IRC ICQ: 13735144 AIM: LarpGM Site: http://www.gushi.org ---------------------------