• NCAR Annual Report
• CISL report
• EOL report
• ESSL report
• RAL report
• SERE report

Network Path and Applications Diagnosis (NPAD)

		This slide from one of the NPAD presentations notes that nearly all network problems are affected by Round Trip Time (RTT). NPAD attempts to address diagnosing network problems taking into account path delay.

The primary goal for the Network Path and Applications Diagnostics (NPAD) project was to develop network diagnostic techniques that address the effects of path delay inherent in transmitting data across wide area networks. This effort investigated an unexplored area of the Internet end-to-end performance problem.

During the final year of this project, we have further refined the prototype diagnostic tool (pathdiag) and successfully deployed it at multiple sites across the United States: Pittsburgh Supercomputing Center and Three Rivers Optical Exchange, National Center for Atmospheric Research and the Front Range GigaPoP, Internet 2 in Ann Arbor, Michigan, Duke University, and Lawrence Berkeley National Laboratory. This project will be completed by November 30, 2007.

We have prepared and submitted a technical paper that summarizes the project for publication.

NETS' research activities support NCAR's strategic priority of "Developing and providing advanced services and tools." This work is supported by NSF award 0334061 through subaward 1120444-145302 with the Pittsburgh Supercomputing Center.