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This is my personal blog about my research interests. These days i focus mainly on:
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Internet Topology & Modeling
Models of the Internet are useful. Operators want to ask "what-if"-questions, researchers need models for accurate evaluation. However, this is still an active research area.
Limitations of observations
The Border Gateway Protocol (BGP), was designed as an information hiding protocol mainly for scalability reasons. We must say, it's really good at it ;). Our work in this area tries to understand what can be inferred from observations and what can't. It turns out that data can be very easily deceiving, meaning one thinks to have found something real, but it's really not that easy.
- Matthew Roughan, Walter Willinger, Olaf Maennel, Debbie Perouli, Randy Bush;
"10 Lessons from 10 Years of Measuring and Modeling the Internet's Autonomous Systems" in Special Issue of IEEE Journal on Selected Areas in Communications (J-SAC) on Measurement of Internet Topologies, 2011. (paper)
- Randy Bush, Olaf Maennel, Matthew Roughan, and Steve Uhlig; "Internet optometry: assessing the broken glasses in Internet reachability"; in Internet Measurement Conference 2009, Chicago, USA, November 2009. (paper)
- Matthew Roughan, Jonanthan Tuke, Olaf Maennel; "Bigfoot, Sasquatch, the Yeti and other missing links: what we don't know about the AS graph"; Internet Measurement Conference, Vouliagmeni, Greece, October 20 - 22, 2008. (paper)
Attempts to create models
The subject is not trivial, but there is no progress if we do not try. In this section we list some papers that look into creating tools to build realistic models and also into methodologies to convert observations into models.
- Wolfgang Mühlbauer, Anja Feldmann, Olaf Maennel, Matthew Roughan, Steve Uhlig; "Building an AS-topology model that captures route diversity"; in ACM SIGCOMM; Pisa (Italy), September 2006. (paper)
- Wolfgang Mühlbauer, Steve Uhlig, Bingjie Fu, Mickael Meulle, Olaf Maennel; "In Search for an Appropriate Granularity to Model Routing Policies"; in ACM SIGCOMM, Kyoto (Japan), September 2007. (paper)
- Hamed Haddadi, Damien Fay, Almerima Jamakovic, Olaf Maennel, Andrew W. Moore, Richard Mortier, Steve Uhlig; "On the Importance of Local Connectivity for Internet Topology Models"; in 21st International Teletraffic Congress (ITC 21), Paris, France, September 2009. (paper)
A useful tool was build in Adelaide by Simon Knight.
- Hung Nguyen, Matthew Roughan, Simon Knight, Nick Falkner, Olaf Maennel, Randy Bush; "How to Build Complex, Large-Scale Emulated Networks"; in the 6th International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TridentCom), Berlin, Germany, May 2010. (paper)
Bridging the gap between routing theory and operational practice
There is excellent work about routing convergence properties by Tim Griffin. However, bridging the gap between theory and practice. Is it possible to define an abstract language that captures the ingredients of Internet routing? No papers yet.
- Debbie Perouli, Timothy G. Griffin, Olaf Maennel, Cristel Pelsser, Iain Phillips, Sonia Fahmy; "Detecting the Unintended in BGP Policies"; work-in-progress/paper-draft not published yet.
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Internet Measurements
BGP data analysis
Sometimes it is useful to dig into lots of data and take whatever shows-up. While this in itself is not a very good scientific approach, it sometimes maybe the only way to understand what is going on. If we sit back and try to see the properties of the data in a broader light, some insights might be derived. It is, however, critical to keep an eye on the limitation, they might be overlooked very easily.
- Anja Feldmann, Olaf Maennel, Z. Morley Mao, Arthur Berger, Bruce Maggs; "Locating Internet Routing Instabilities"; in ACM SIGCOMM, Portland (USA), August 2004. (paper)
- Olaf Maennel, Anja Feldmann; "Realistic BGP Traffic for Test Labs"; in ACM SIGCOMM, Pittsburgh (USA), August 2002. (paper)
- Ashley Flavel, Matthew Roughan, Nigel Bean, and Olaf Maennel; "Modeling BGP Table Fluctuations"; in 20th International Teletraffic Congress, Ottawa, Canada, June 2007. (paper)
- Cristel Pelsser, Olaf Maennel, Pradosh Mohapatra, Randy Bush, and Keyur Patel; "Route Flap Damping Made Usable"; In Proceedings of Passive and Active Measurement Conference (PAM), March, 2011. (paper; ietf-draft)
BGP dynamics, beware data is typically messy.
- Ashley Flavel, Olaf Maennel, Belinda Chiera, Matthew Roughan, Nigel Bean; "CleanBGP: Verifying the Consistency of BGP Data"; in Internet Network Management Workshop, Orlando, Florida, USA, October 19, 2008. (paper)
Reachability
Measuring reachability.
- Randy Bush, James Hiebert, Olaf Maennel, Matthew Roughan, Steve Uhlig; "Testing the reachability of (new) address space"; ACM SIGCOMM, INM'07 workshop, Kyoto (Japan), September 2007. (paper)
Evolution of address space & diversity.
- Luca Cittadini, Wolfgang Mühlbauer, Steve Uhlig, Randy Bush, Pierre Francois, Olaf Maennel; "Evolution of Internet Address Space Deaggregation: Myths and Reality"; in IEEE Journal on Selected Areas in Communications, VOL. 28, NO. 8, October 2010. (paper)
- Wolfgang Mühlbauer, Steve Uhlig, Anja Feldmann, Olaf Maennel, Bruno Quoitin, Bingjie Fu; "Impact of Routing Parameters on Route Diversity and Path Inflation"; in Computer Networks (COMNET)
Volume 54, Issue 14, 6 October 2010, Pages 2506-2518. (paper)
- Andrew Coyle, Miro Kraetzl, Olaf Maennel, Matthew Roughan; "On the predictive power of shortest-path weight inference"; Internet Measurement Conference, Vouliagmeni, Greece, October 20 - 22, 2008. (paper)
Controlled experiments in a Test-Lab
While "fishing experiments" in Internet data can be great fun, it is similar critical to design controlled experiments in a test-lab.
- Anja Feldmann, Hongwei Kong, Olaf Maennel, Alexander Tudor; "Measuring BGP Pass-Through Times"; in Passive and Active Measurement Workshop (PAM), Antibes Juan-les-Pins (France), April 2004. (paper)
Traffic characterization
- Anja Feldmann, Nils Kammenhuber, Olaf Maennel, Bruce Maggs, Roberto De Prisco, Ravi Sundaram; "A Methodology for Estimating Interdomain Web Traffic Demand"; Internet Measurement Conference (IMC); Sicily (Italy), October 2004. (paper)
IPv6 measurements
What if we adopt to IPv6 right now? Is the Internet ready?
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IPv6
Address sharing technology
- Gabor Bajko, Mohamed Boucadair, Steven M. Bellovin, Randy Bush, Luca Cittadini, Olaf Maennel, Reinaldo Penno, Teemu Savolainen, Jan Zorz; "The A+P Approach to the Broadband Provider IPv4 Address Shortage"; ietf-draft.
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New Internet Technology
Network Virtulization
- Gregor Schaffrath, Christoph Werle, Panagiotis Papadimitriou, Anja Feldmann, Roland Bless, Adam Greenhalgh, Andreas Wundsam, Mario Kind, Olaf Maennel, Laurent Mathy; "Network Virtualization Architecture: Proposal and Initial Prototype" in ACM SIGCOMM Workshop on Virtualized Infastructure Systems and Architectures - Barcelona, Spain, August 2009. (paper)
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Anja Feldmann, Mario Kind, Olaf Maennel, Gregor Schaffrath, Christoph Wehrle; "Network Virtualization
An Enabler for Overcoming Ossification" in ERCIM News Journal, (77):21-22, April 2009. (paper)
- Panagiotis Papadimitriou, Olaf Maennel, Adam Greenhalgh, Anja Feldmann, Laurent Mathy; "Implementing Network Virtualization for a Future Internet"; in 20th ITC Specialist Seminar on Network Virtualization - Concept and Performance Aspects, Hoi An, Vietnam, May 18 - 20, 2009. (paper)
- Olaf Maennel, Frederic Dang Tran, Rastin Pries, Panagiotis Papadimitriou; "Panel discussion: Experimental Facilities and Network Virtualization.; at 20th ITC Specialist Seminar, Hoi An, Vietnam, May 2009.
Redesigning iBGP
- Iuniana Oprescu, Mickaël Meulle, Steve Uhlig, Cristel Pelsser, Olaf Maennel, Philippe Owezarsk; "oBGP: an Overlay for a Scalable iBGP Control Plane" in International Federation for Information Processing (IFIP) - Networking 2011, Valencia, Spain, May 2011. (paper)
- Iuniana Oprescu, Mickael Meulle, Steve Uhlig, Cristel Pelsser, Olaf Maennel, Philippe Owezarski; "Rethinking iBGP Routing"; ACM SIGCOMM 2010 Poster and Demo Sessions, New Delhi, India, Aug. 2010. (demo)
BGP add-path
No publications here yet.
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Internet Security
BGP security / RPKI
No work here yet, but a student got interested in this area.
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| Olaf Maennel | skype: olaf_maennel | e-mail: om@maennel.net | 03 Aug 2011 | |
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