Universität Duisburg-Essen
Verteilte Systeme
Dipl.-Inform. Sebastian Holzapfel
Sebastian Holzapfel Phd Student

Building BC, Room 317
Bismarckstr. 90
47057 Duisburg, Germany

fon +49 (0) 203/379-3977
fax +49 (0) 203/379-4490
email: sebastian.holzapfel(at)uni-due.de

Consultation hour: by appointment

Brief CV

05/2008 Researcher with the Distributed Systems Group, Universität Duisburg-Essen
04/2008 Diplom in Computer Science
2003-2008 Study of Computer Science, Universität Duisburg-Essen

Research Interests

Peer-to-Peer Systems, Peer-to-Peer based Storage Systems and NAT Traversal in Peer-to-Peer Systems


The papers available for download as PDF refer to the originally submitted version, and can differ from the camera ready paper (due to copyright restrictions).
  1. Matthäus Wander, Sebastian Holzapfel, Arno Wacker, and Torben Weis: NTALG – TCP NAT Traversal with Application-Level Gateways (Demonstration). 9th IEEE Consumer Communications and Networking Conference, CCNC 2012, Las Vegas, Nevada, USA, January 14 - 17, 2012.
  2. Sebastian Holzapfel, Arno Wacker, Torben Weis, and Matthäus Wander: An Architecture for Complex Peer-to-Peer Systems. Proceedings of the 4th IEEE International Workshop on Digital Entertainment, Networked Virtual Environments, and Creative Technology, DENVECT 2012, held in conjunction with the IEEE Consumer Communications and Networking Conference, CCNC 2012, Las Vegas, Nevada, USA January 14 - 17, 2012.
  3. Sebastian Holzapfel, Matthäus Wander, Arno Wacker, and Torben Weis: SYNI – TCP Hole Punching Based on SYN Injection. Proceedings of the The 10th IEEE International Symposium on Network Computing and Applications, IEEE NCA 2011, Cambridge, MA, USA August 25 - 27, 2011.
  4. Sebastian Holzapfel, Sebastian Schuster, and Torben Weis: VoroStore – A Secure and Reliable Data Storage for Peer-to-Peer-based MMVEs. Proceedings of the International Workshop on Resource Discovery Mechanisms for P2P Systems, P2P-RDM 2011, held in conjunction with the 11th IEEE International Conference on Computer and Information Technology, CIT 2011, August, 31st – September, 2nd 2011 in Pafos (Paphos), Cyprus.
  5. Helge Parzyjegla, Arnd Schröter, Enrico Seib, Sebastian Holzapfel, Matthäus Wander, Jan Richling, Arno Wacker, Hans-Ulrich Heiß, Gero Mühl and Torben Weis: Model-Driven Development of Self-Organizing Control Applications. Chapter 2.1, in Organic Computing - A Paradigm Shift for Complex Systems, Editor: Christian Müller-Schloer and Hartmut Schmeck and Theo Ungerer, Birkäuser Verlag, Basel, Switzerland, June 2011.
  6. Sebastian Holzapfel, Matthäus Wander, Arno Wacker, Lorenz Schwittmann, and Torben Weis: A New Protocol to Determine the NAT Characteristics of a Host. 8th International Workshop on Hot Topics in Peer-to-Peer Systems, HotP2P 2011, held in conjunction with the 25th IEEE International Parallel & Distributed Processing Symposium, IPDPS 2011, Anchorage, Alaska, USA, May 16-20, 2011.
  7. Martin Saternus, Torben Weis, Sebastian Holzapfel, Arno Wacker: Gears4Net - an Asynchronous Programming Model. Proceedings of the Workshop on Parallel Programming Models and Systems Software for High-End Computing (P2S2), organized at the 38th International Conference on Parallel Processing 2009 (ICPP09), Vienna, Austria, Sept. 22-25, 2009.
  8. Mirko Knoll, Matthias Helling, Arno Wacker, Sebastian Holzapfel and Torben Weis: Bootstrapping Peer-to-Peer Systems Using IRC. Proceedings of the 5th International Workshop on Collaborative Peer-to-Peer Systems, COPS09, organized at the 18th IEEE International Workshops on Enabling Technologies: Infrastructures for Collaborative Enterprises, WETICE 2009, Groningen, The Netherlands, June 29th - July 1st, 2009.
  9. Torben Weis, Arno Wacker, Sebastian Schuster, Sebastian Holzapfel: Towards Logical Clocks in P2P-based MMVEs. Proceedings of the 1st International Workshop on Concepts of Massively Multiuser Virtual Environments, CoMMVE09, organized at the 16th ITG/GI Fachtagung - Kommunikation in Verteilten Sytemen 2009, KiVS 2009, Kassel, March 2-6, 2009.
  10. Arno Wacker, Gregor Schiele, Sebastian Holzapfel, and Torben Weis: (Demo) A NAT Traversal Mechanism for Peer-To-Peer Networks. Proceedings of the 8th International Conference on Peer-to-Peer Computing, IEEE P2P08, Aachen, Germany, September 2008.

Programm Committees

  • The 4th International Workshop on Massively Multiuser Virtual Environments, MMVE11 at the IEEE International Symposium on Audio-Visual Environments and Games (HAVE 2011)
  • The 3nd International Workshop on Massively Multiuser Virtual Environments, MMVE10 at the ACM International Conference on Advances in Computer Entertainment Technology 2010


In the following you'll find a list of my (co-)organized teaching activities.
  • Seminar: Mobile Applications (Winter term 2011/2012)
  • Project: Geo Photo Gallery (Winter term 2011/2012)
  • Exercises for Cloud, Web and Mobile (Winter term 2011/2012)
  • Exercises for Sicherheit in Kommunikationssystemen (Summer term 2011)
  • Exercises for Rechnernetze und Kommunikationssysteme (Winter term 2010/2011)
  • Project: Verteilte Systeme (Winter term 2010/2011)
  • Exercises for Rechnerarchitektur (Summer term 2010)
  • Exercises for Sicherheit in Kommunikationssystemen (Summer term 2009)
  • Project: Verteilte Systeme (Summer term 2009)
  • Exercises for Rechnernetze und Kommunikationssysteme (Winter term 2008/2009)
  • Exercises for Microcomputer Systems (Winter term 2008/2009)


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