IEPM accomplishments August 2000 July 2001

Les Cottrell, Assistant Director SLAC Computing Services, Stanford linear Accelerator Center (SLAC)


In the last year we have extended the PingER tools to provide new metrics and reports. At the same time we continue to run in a production fashion the project which now monitors over 500 sites in over 70 countries from over 30 sites. We also maintain the software for traceroute servers around the world and run a reverse traceroute server for public use that gets thousands of hits/day. We maintain and update a web page providing access to Network tools for public use. We provide a tutorial on Internet Monitoring for public use. We have submitted 7 proposals for funding, and 2 have been successfully funded. We have provided detailed assistance for debugging performance problems to sites including IHEP/Beijing, Novosibirsk, BNL, Platform computing, IN2P3, UT Dallas and several DSL ISPs. We have set up and developed tools to provide passive monitoring at the SLAC border and have or will soon present several papers on the results. To drive the monitoring efforts to higher layers of the protocol stack, we are developing tools to measure high speed bulk throughput and to understand how to achieve it at the network and applications layers. We have also understood the ns network simulator and validated its results versus actual measurements of bulk throughput. We are now working to see how to use QoS to limit the effect of high throughput on other users.


The SLAC IEPM group has joint projects with:

We have worked closely with people from: LBL, UTK, PSC, and ANL to propose to DoE a project on Active Internet Measurement for ESnet; Georgia Tech to propose to DoE a project on Optimizing Performance Through Simulation.

We are collaborating closely with the Internet 2 Surveyor measurement people and have compared and analyzed much of their data; and are working with the QBone Scavenger Service design team.

We have very close relations with the worldwide HENP community that PingER was initially set up to support. We will be presenting 4 papers at the next Computing in High Energy Physics meeting in Beijing in September 2001, the IEPM PI is a referee for the conference. We have given several talks and attended conferences in our own HENP community. The IEPM PI is actively involved in the PPDG in particular with respect to understanding how to achieve high speed bulk throughput on the Internet. PingER contributed a panel to the SLAC/FNAL booth at SC2000 and will contribute a panel to the SC2001 booth.

We are actively involved in the Internet measurement community and have given presentations and attended Internet 2 meetings, the Passive & Active Monitoring (PAM) meetings, the Web100 development project (we are an alpha evaluator and have attended their meetings), the IETF, and the Ipv6 community (where we have given several talks at the IETF and elsewhere, and our tools are in use at STARTAP for monitoring, and we submitted an IPv6 proposal to DoE). We are also involved in other fields. We support the Cross Industry Working Team and they are using our PingER software for active monitoring and we have attended their meetings and made presentations. We are working as part of an SBIR with a startup, NetPredict, in evaluating tools for predicting network performance. We are in close contact with some ITU members and have made presentations and attended ITU meetings. We worked with the Stanford University Computer Music people and contributed to the San Francisco Museum of Modern Art Ping 2001 exhibit. We gave a series of lectures on the Internet at the NSF funded International Nathiagali Summer College in Pakistan., as well as a lecture on "Characterizing the Internet" to Stanford summer students..

Publications, presentations etc.