Wolfgang Mühlbauer Technische Universität Berlin An-Institut Deutsche Telekom Laboratories FG INET, Sekr. TEL 4 Ernst-Reuter-Platz 7 10587 Berlin, Germany Phone:   +49 30 8353 58378 Fax: +49 391 534 78347 e-mail:  wolfgang@net.t-labs.tu-berlin.de
Contact in Munich: Technische Universität München Institut für Informatik / I8 Boltzmannstraße 3 85748 Garching b. München, Germany Phone:   +49 89 289 18580 Room:   03.05.057

Teaching

• Hauptseminar: Internet Measurement (WS2008/2009)
• Internet-Praktikum: Router-Lab (SS2008)
• Hauptseminar: Internet Routing (WS2007/2008)
• Hauptseminar: Internet Sicherheit (WS2006/2007)
• Internet-Praktikum: Router-Lab (SS2006)
• Hauptseminar: Internet Routing (SS2006)
• Tutor "Diskrete Strukturen I" (WS2004/2005)
• Tutor "Konkrete Mathematik" (WS2002/2003)

Research Interests

• Inter-Domain Routing:
  The complex interactions arising in huge distributed systems like the Internet are still poorly understood. In my work, I try to get a better understanding of the routing layer in the Internet. This involves a detailed study of the interactions and routing decisions arising from BGP. Based on the obtained insights, I'm exploring ways how to build inter-domain routing models with the focus on routing policies: What level-of-detail is needed to model the Internet accurately and what details can be neglected to keep the model scalable? Work done so far in this area is joint work with Olaf Maennel, Steve Uhlig and my advisor Prof. Anja Feldmann.

• Clean Slate Routing Architectures:
  Today's routing architecture has significant deficiencies: Routing table growth, high updates rates, lack of mobility, insufficient support for multi-homing or traffic engineering etc. Given these problems, many researchers currently believe that these shortcomings cannot be resolved by the conventional incremental style of research. Clean-slate research can be characterized by the following question: "How would we design the Internet if we could start from scratch?" Currently, I'm working on a clean-slate routing architecture that addresses the aforementioned problems and that is nevertheless incrementally deployable. Work in this area is partially funded by the Trilogy project.

• Design of Network Testbeds and Network Virtualization:
  To evaluate new ideas and protocols in the context of clean-slate design, we need network testbeds. This work thread explores and compares possible ways of setting up such network testbeds. The focus is on means of network virtualization, i.e., the ability of physical network resources to be partitioned into multiple logical resources. I have participated in the VINI summer camp and the VINI project.

• Seamless Mobility:
  Mobility is a requirement not appropriately addressed by the original design of the Internet since an IP address has two fundamentally different tasks. It specifies a network location (for routing) and serves as an identifier (for application addressing). Therefore moving between two locations usually implies a change in IP address, due to moving to a different network domain. This typically breaks existing network connections and thus hinders mobility. I have been working on solutions that allow for seamless IP mobility and that are easy to deploy.

Research Activities and Results

Publications: Conferences, Workshops

• Building an AS-topology model that captures route diversity
  Wolfgang Mühlbauer, Anja Feldmann, Olaf Maennel, Matthew Roughan, Steve Uhlig
  ACM SIGCOMM, Pisa, Italy, 2006
  [paper][slides]
  
• Modeling as a necessary step for understanding Internet-wide route propagation
  Steve Uhlig, Olaf Maennel, Wolfgang Mühlbauer
  Workshop on Internet Routing Evolution and Design (WIRED), Atlanta, GA, USA, 2006
  [paper]
  
• In Search for an Appropriate Granularity to Model Routing Policies
  Wolfgang Mühlbauer, Steve Uhlig, Bingjie Fu, Mickael Meulle, Olaf Maennel
  ACM SIGCOMM, Kyoto, Japan, 2007
  [paper][slides]
  
• Policy Modeling and Management
  Wolfgang Mühlbauer
  Workshop on Programmable Routers for the Extensible Services of TOmorrow (PRESTO), Princeton, NJ, USA, 2007
  [paper][slides]
  
• Enabling Seamless Internet Mobility
  Gregor Maier, Wolfgang Mühlbauer, Yevgen Rogoza, Anja Feldmann
  Workshop at Conference on Emerging networking EXperiments and Technologies (CoNEXT), New York, NY, USA 2007
  [paper]
  
• Enabling Seamless Internet Mobility
  Anja Feldmann, Gregor Maier, Wolfgang Mühlbauer, Yevgen Rogoza
  16th IEEE Workshop on Local and Metropolitan Area Networks (LANMAN), Cluj-Napoca, Romania, 2008
  [paper][slides]
  
• Trellis: A Platform for Building Flexible, Fast Virtual Networks on Commodity Hardware
  S. Bhatia, M. Motiwala, W. Mühlbauer, Y. Mundanda, V. Valancius, A. Bavier, N. Feamster, L. Peterson, J. Rexford
  3rd International Workshop on Real Overlays & Distributed Systems (ROADS) at CoNEXT 2008, Madrid, Spain, 2008 (to appear)
  [paper]
  

Technical Reports

• Hosting virtual networks on commodity hardware
  S. Bhatia, M. Motiwala, W. Mühlbauer, V. Valancius, A. Bavier, N. Feamster, L. Peterson, J. Rexford
  Georgia Tech Computer Science Technical Report GT-CS-07-10, Atlanta, GA, USA, 2008
  [paper]
  
HAIR: Hierarchical Architecture for Internet Routing
Anja Feldmann, Randy Bush, Luca Cittadini, Olaf Maennel, Wolfgang Mühlbauer
Technische Universität Berlin, Rote Reihe Informatik (ISSN: 1436-9915) , Technical Report 2008-14
[paper]

Poster

• Hosting virtual networks on commodity hardware
  S. Bhatia, M. Motiwala, W. Mühlbauer, V. Valancius, A. Bavier, N. Feamster, L. Peterson, J. Rexford
  [poster]
  
• Enabling Seamless Internet Mobility
  Anja Feldmann, Gregor Maier, Wolfgang Mühlbauer, Yevgen Rogoza
  [poster]
  
• Trilogy and 4WARD: Towards a Clean Slate Internet Design
  Wolfgang Mühlbauer, Roger Karrer, Peter Feil, Anja Feldmann
  [poster]
  
• Scaling the Future Internet Routing System with Hierarchical Locators
  Randy Bush, Luca Cittadini, Anja Feldmann, Olaf Maennel, Wolfgang Mühlbauer
  [poster]
  
• Sensitivity Analysis of Internet Routes Regarding Optimality and Diversity
  Wolfgang Mühlbauer, Anja Feldmann, Steve Uhlig, Olaf Maennel, Bingjie Fu, Bruno Quoitin
  [poster]
  

Projects

• Trilogy
  I'm partly funded by Trilogy, a research project (ICT-216372) supported by the European Community under its Seventh Framework Programme. For more information, please visit the Trilogy website.
• CRISP
  A Telekom internal project that tries to identify mid-term solutions for the problems of today's routing architecture.

Review Activities

• TPC member for International Workshop on the Network of the Future 2009
• Reviewer for IEEE/ACM Transactions on Networking

Miscellaneous (Talks, Meetings)

• Building an AS-topology model that captures route diversity
  4th DE-CIX Technical Meeting, Frankfurt am Main, April 2006
• Building an AS-topology model that captures route diversity
  3rd Annual DELIS Workshop, Bertinoro, Italy, January 2007
• In Search for an Appropriate Granularity to Model Routing Policies
  Deutsche Telekom Laboratories, Advisory Board Meeting, Berlin, Germany, October 2007
• In Search for an Appropriate Granularity to Model Routing Policies
  Deutsche Telekom Laboratories, Advisory Board Meeting, Berlin, Germany, October 2007
• Virtual Network Infrastructure (VINI) - Hosting Virtual Networks on Commodity Hardware
  Université Catholique Louvain-la-Neuve (UCL), Louvain-la-Neuve, Belgium, November 2007
  Technische Universiteit Delft, Delft, Netherlands, November 2007
  [slides]
• Various Talks at Trilogy plenary meetings
  Heidelberg, London, Helsinki, Louvain-la-Neuve

Study of Computer Science (Informatik) at TU München

• Wolfgang Mühlbauer: "Towards Reproducing Inter-Domain AS Paths"
  Diplomarbeit (diploma thesis), Technische Universität München, November 2005
  [thesis][slides]
  
• Wolfgang Mühlbauer: "Sensibility Analysis of BGP Convergence and Scalability Using Network Simulation"
  Systementwicklungsprojekt (project for master thesis), Technische Universität München, September 2004
  [thesis][slides]
  
• Matthias Wimmer, Wolfgang Mühlbauer: "Bandwidth Consumption in Multipath Resilience Networks"
  Interdisziplinäres Projekt (project for master thesis), Technische Universität München, August 2003
  [thesis][slides]
  

Personal Interests

• Everything which is related to mountains: Climbing, skiing, hiking, ...
• Running, cycling
• Reading
• Piano
• Faire la grève!
• ...