Toronto Networking Seminar

Organized by Department of Computer Science and Department of Electrical and Computer Engineering, University of Toronto

The SpoVNet Architecture and its Underlay Abstraction Layer –
Spontaneous Service Provisioning in Heterogeneous Networks

Oliver P. Waldhorst
University of Karlsruhe, Germany

Date: Friday, October 2, 2pm
Location: BA 1210 


Overlay-based services are a popular approach for providing functionality like multicast, quality of service or security in the Internet without requiring infrastructure support. This talk presents an overview of the Spontaneous Virtual Networks (SpoVNet) architecture and its Underlay Abstraction layer that enables easy and flexible creation of such services. Also building on an overlay approach, the Underlay Abstraction provides generic functionality to cope with mobility, multi-homing, and heterogeneity. It manages node mobility by separating node identifiers from network locators and it provides persistent connections by transparently switching locators. Multi-homing is supported by choosing the most appropriate pair of network locators for each connection. In order to cope with network and protocol heterogeneity, it uses dedicated overlay nodes, e.g., for relaying between IPv4 and IPv6 hosts. Since the functionality provided by the Underlay Abstraction can be used by several overlay-based services in parallel, redundant functionality is removed from services and applications.


Oliver P. Waldhorst received a Diplom-Informatiker degree (comparable to M.Sc. in computer  science) in 2000 and a Ph.D. in computer science in 2005 from University of Dortmund, Germany.  He is currently a post doctoral researcher at University of Karlsruhe, Germany, where he is  leading a Young Investigator Group, a junior research group funded by the 'Concept for the Future' of Karlsruhe Institute of Technology within the framework of the German Excellence Initiative. From September 2009 to February 2009 he is a visiting researcher in the group of
Prof. Liebeherr at University of Toronto. His research interest include peer-to-peer- and  overlay-networks in
next-generation communication systems, Grid applications in mobile and hybrid environments as well as modeling and analysis of spontaneous, self-organizing systems. For more  information visit

Host of the talk

Jörg Liebeherr (