NetSpec has been used by a number of research projects at the University of Kansas (KU) and elsewhere. It provides the automation and script based framework supporting experiments including a wide range of conditions, component behaviors, and data collection [12,16]. NetSpec is designed to be extended and modified by the user through the implementation of daemons supporting specific component roles in experiments. Test daemons are used as active components, traffic sources and sinks, while measurement daemons are passive with respect to the experiment since they only collect measurements. Existing NetSpec daemons support network level performance tests with many simultaneous connections and traffic load profiles, as well as data collection from both hosts and network nodes using measurement daemons. A wide range of NetSpec daemons exist, providing a range of behaviors and functions, including: TCP/UDP traffic load, ATM signaling load, SNMP data collection, and DSKI data collection from the operating system.