Cristel Pelsser's blog


Archive for June, 2013

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