Cristel Pelsser's blog

Researcher

On the Suitability of ping to Measure Latency

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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.

CDF of RTTs between Dallas and Ashburn

More information on our experiments can be found in RIPE 66 or NANOG 58 presentations. See Olivier Bonaventure’s blog post for a brief explanation of ping and flow-based hashing.

The code to run the measurements is here.

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June 19th, 2013 at 12:33 pm

Posted in Conference

Applied Networking Research Prize on the BGP reconfiguration work

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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 Recon´Čügurations. Proc. IEEE/ACM Transactions on Networking (TON), To Appear.

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June 18th, 2013 at 5:45 pm

Posted in anrp,prize

Summarising a year and a half of research

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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.

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June 18th, 2013 at 5:38 pm

Posted in Conference

The Japan Earthquake: the impact on traffic and routing observed by a local ISP

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Here is the presentation I gave at Roma Tre.

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October 15th, 2011 at 2:57 am

What happened during the Great East Japan Earthquake?

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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.

Reference:
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

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October 6th, 2011 at 6:12 pm

IGP migration paper accepted at SIGCOMM 2011

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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.

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May 9th, 2011 at 3:41 pm

Posted in Conference

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Call for interns

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Hi,

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 :)

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May 2nd, 2011 at 5:58 pm

Posted in Uncategorized

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Tamias

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Tamias website is online http://tamias.iijlab.net/.

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April 21st, 2011 at 2:26 pm

BGP graceful shutdown requirements finaly made it into RFC

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See rfc6198

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April 15th, 2011 at 5:11 pm

Posted in IETF

Tamia to be presented at FAST 2011

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Jean Lorchat, Cristel Pelsser, Randy Bush, Keiichi Shima. “Tamia: A Privacy Aware Distributed Storage”. FAST’2011 Poster, Feb 2011.

FAST 2011

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February 3rd, 2011 at 6:24 pm