background network traffic generator?

From: xin (jqxin_at_iastate.edu)
Date: 02/19/04 

Date: 18 Feb 2004 22:39:15 -0800

hi,
We are trying to building a test bed for our project of intrusion
detection. The need of background network traffic generator emerges as
we want to generate some normal network packages. Is there any
avaialble software packages? Thanks very much for your kind help.

yours,
xin