While trying to detect the effect of routing configuration changes on network performance, we observed high RTT variability in ping measurements. We took a closer look and found stable per-flow RTTs but significant RTT difference between flows. The figure illustrates this finding. It shows the cumulation distribution of RTTs measured from Dallas to Ashburn. The red staircase is obtained with ping. The vertical curves are the RTT distributions observed for different flow ids.
The code to run the measurements is here.
Our ToN paper (*) won the Applied Networking Research Prize. It will be presented at the IRTF Open Meeting during IETF-87 in Berlin, Germany.
(*) Stefano Vissicchio, Laurent Vanbever, Cristel Pelsser, Luca Cittadini, Pierre Francois and Olivier Bonaventure. Improving Network Agility with Seamless BGP Reconﬁgurations. Proc. IEEE/ACM Transactions on Networking (TON), To Appear.
A few things happened since I last updated this blog. Research-wise, my publication list may be a good summary of the last events. Lately I worked on
- IGP and BGP seamless reconfigurations,
- Tamias, a distributed storage built on privacy and identity, and
- the detection of unsafe BGP policies
See publications for the list of relative publications.
Here is the presentation I gave at Roma Tre.
Our analysis of traffic and routing behavior for a Japanese ISP for the month of March will be available at the end of the year.
What is unique about this paper is that we used iBGP data from a neighboring ISP to study the effect of failures in our ISPs on the outside world.
K. Cho, C. Pelsser, R. Bush and Y. Wong, “The Japan Earthquake: the impact on traffic and routing observed by a local ISP”, Accepted to CoNEXT 2011 special workshop on the Internet and disasters, ACM, Dec. 2011.
The program of the workshop where this will be published is here
Here is the reference:
Laurent Vanbever, Stefano Vissicchio, Cristel Pelsser, Pierre Francois and Olivier Bonaventure. “Seamless Network-Wide IGP Migrations”. In Proc. of SIGCOMM 2011, August 2011.
The complete list of accepted papers can be found here: accepted papers.
We just put up a call for interns on the lab’s website. Here is it: call for interns. Please apply or forward to interested parties
Tamias website is online http://tamias.iijlab.net/.
Jean Lorchat, Cristel Pelsser, Randy Bush, Keiichi Shima. “Tamia: A Privacy Aware Distributed Storage”. FAST’2011 Poster, Feb 2011.