Status Report for SLAC/DOE IEPM Project

For June & July 1999

SLAC Home Page

Work related to Collaborations


Les met with Hungbin Hu from Wuhan university to go over the SLAC LAN, monitoring and the IEPM effort.


Les attended an ICFA Standing Committee on Internet Connectivity (SCIC) video meeting and made presentation on Status of SCIC Working Group on Monitoring. Followed up by talking to Jim Leighton of ESnet about the KEK ESnet link, and providing information on how the .de<=>.ca performance compares<=>.edu performance, & how the German Russian connectivity is performing. Had email discussion with Michael Ernst concerning DFN and ICMP rate limiting.

Les sent email to the chairman of the ESSC suggesting a talk on ESnet monitoring at the Santa Fe meeting at the end of August.


Les arranged a phone meeting with the FNAL/HEPNRC folks to re-involve them in the PingER project. Had voice meeting with Bill Lidinsky, Michael, and Shiqi Hi from HEPNRC and Warren to get everyone up to speed on projects, to parse them out in terms of priority and who is interested and decide on some actions. As part of preparation for the meeting, Les put together some rough notes from the ICFA/SCIC meeting earlier in the month. Les also put together some rough notes of the meeting with HEPNRC.

Warren has sent several emails to the new HEPNRC employee (Michael) regarding the present state and future plans for the data acquisition code. Warren has sent the most recent poisson code hoping he will take over it's development.


Reviewed an early draft of a white paper from the XIWT. Started preparing a web page providing a comparison between PingER/Surveyor/AMP/RIPE/skitter. Corresponded with some of the project leaders in order to check information. See Comparison of some Internet Active End-to-end Performance Measurement projects.


Corresponded with RIPE and Waikato folks to compare their projects with other active active end-to-end performance measuring projects. The machine for the RIPE-IDM monitoring arrived and has been installed. We are waiting for the GPS aerial to be set up before the machine is fully operational.


Warren obtained and processed the June Surveyor data.

NGI Testbed

Les attended the NGI Testbed workshop in Berkeley. As part of the preparation he set up a PingER web page for the Particle Physics Data Grid project, and one for the NGI testbeds. Les also put together and presented a talk on the IEPM/PingER project and PPDG.

Other sites

Warren worked with Larry Gerhardstein and Cullen Tollbom to get PingER installed at PNL. The software is installed and operational, but there is not currently a hole in their firewall through which SLAC can retrieve the data. If they make it available we will process it.

Tools & Analysis

PingER and Ping Validation

Rebecca and Les worked on extending the help for PingER. Following a suggestion from Mike Sullenberger of Cisco, Les worked with Rebecca to find out what the maximum segment size is between SLAC and the beacon sites. Got confirmation from Vern Paxson.

Warren has been working with Boris Bertucci (a visiting French student) to use tcpdump to passively measure and understand the SLAC DMZ traffic.

Warren installed a modified version of Pinger from Jeremy Hylton (CNRI/XIWT). We now store all the results from the ping probes, so we can do further analysis.

The pinger configuration details are now stored in an Oracle database, this is the first step in converting much of the data and analysis work to java and perl database connectivity.

As part of the database move, our student Yvonne Gbalazeh has written a managemnt program tha twe have dubbed "Guthrie" to manage the database access. The latest code has been made available on our ftp site.

Warren also wrote a perl program that updates the list of remote sites, using the details stored in the database.


Warren installed a program from Jeremy that logs traceroute results. The data is made available but needs processing!

Sites & groups

Les worked with Rebecca to come up with a list of all the AMP/Pinger/Surveyor and RIPE sites and see how they match up with each other and with various HENP (Atlas, BaBar, Belle, CMS, D0, Zeus)/ESnet/DOE funded/Internet 2/vBNS groupings (e.g. how many of the BaBar sites have Surveyor or AMPs) etc.

Warren also wrote a perl program that updates the list of remote sites, using the details stored in the database.


We are trying to use a modified TTCP to add load to the line, but it wouldn't make a connection. We used TCPDUMP to discover the code was creating packets with the wrong IP address. Kishan found the part of the code that needed modifying and we returned the changes to the author at NASA. We are now testing with NASA, and Kishan is further developing the code to use UDP packets for our tests on the test link.

Network Anomalies

There were some odd problems with several remote sites. Bizarre looping effects were noticed when tracerouting to a set controlled by IBM and at JHU. We suspect some sort of shaping is going on. Also Olemiss appears to have implemented smurf filtering. Unfortunately all Warren's enquiries attempting to get confimration of his suspicions haven't been answered.

Missing data

We lost a significant amount of data from the RAL monitoring site. No solution was found but a new monitoring site has been established at RAL and we are retrieving data from that.

Related to that. The SLAC webserver receives a significant pounding when pingER data is being called. I worked with systems to set up enough anonymous ftp space for the data and moved it from the webserver area. All the data is still available, but should impact SLAC resources less harshly.


We have received a 7200 router from ESnet and Warren worked with Tony Zele to upgrade the IOS on a 2600 to the IPv6 aware version.


Interviewed 3 RA student candidates to work on IEPM. Met with Bjorn Frogner about students and discussed their (NetPredict's) work. Made offers to 2 of the students.

Work Related to Publicity and Information


We have been invited to submit paper to IEEE communications magazine on network traffic measurement and experiments. Warren has begun to put a paper together. Also Warren made a first stab at an abstract for CHEP.


Updated traceroute server web page to point to some archives of traceroutes. Added network weather service and timeit to the Interesting web sites for Internet Monitoring page.


By comparing SLAC phone CDR records with router utilization, came up with an estimate of the ratio of voice traffic between offsite & SLAC with IP traffic between offsite & SLAC the ratio varies from 7:1 to 22:1 (data is higher). Back to Top

Revised 24 July 1999
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