IP Generation program/devices

[mfjs () attmail com (Michael F Sullivan)]

To do some load testing, we need a "tool" (h/w device and/or s/w) to generate 
a programmable amount of IP traffic on a segment (say 32Mbps on a fast enet 
segment or fddi ring) and a way to measure it (w/ hopefully something cheaper 
than a sniffer). Anyone have suggestions on what to use?

Thanks