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Network Architectures and Management group

Spyros Denazis

Spyros Denazis
Associate Professor

Network Architectures & Management Group
Wired Communications Lab
Electrical & Computer Engineering Dept
University of Patras
26500 Patras

Office: +30 2610 996478



CV  (January 2013)
Publications (Full List)


Short Bio

It had taken me 22 years until I returned back to my hometown Patras in 2004 and started growing roots. All started in 1982 when I entered the Mathematics Department of University of Ioannina, Greece, where I graduated from in 1987. In 1993 I got my Ph.D in Computer Science from University of Bradford, UK where I combined my maths background with computer networks leading to my thesis “Queuing Network Models with Blocking and Multiple Job Classes”. Then I had had a ‘short’ break (19 months) in the Greek Military before I joined, in 1996, the R&D Department of Intracom SA in Athens as Project Coordinator. In 1998, I joined the Information Technology Laboratory of Hitachi Europe in Cambridge UK, as a Senior Research Engineer while serving for 3 years (1998-2001) as an Industrial Research Fellow in the Centre for Communications Systems Research , of Cambridge University, UK. Since 2004, I have been a faculty member of the Electrical & Computer Engineering Department, at the University of Patras in Greece. For the period 2003-2010 I had also been a Consultant for the Hitachi Europe Sophia Antipolis Laboratory, in France; during this period we collaborated in a number of research projects both internal and European. Now I am proud to lead a quite active research group, the Network Architecture & Management Group where we conceive new ideas and then we strive to turn them into something useful. The fun goes on!


  • Computer Communication Networks  (Lab Courses using OPNET) (22Y410) (4th Semester)
  • Network Architectures & Protocols I (22A709) (7th Semester)
  • Network Management  (22A005) (10th Semester)
  • Information Theory (22A702) (7th Semester)

New Research Interests (to be updated soon)

My research and interests have been greatly influenced by an interesting period in network research in mid-late-90s, namely, active and programmable (A&P) networks and then in early 2000’s by autonomic networking. The result had been the identification of two interesting problems: a) how to address self-organization properties in heterogeneous networks, and b) how to deal with multiple identities (identity management); both problems relating, in their own ways, with seamless and adaptable end-to-end connectivity. As an aftermath of my persistence with A&P networks through IETF ForCES, this line of research is recently revived in the fashionable topic of Software Defined Networks (SDN). SDN, which comes as a disguise of A&PN, has been (re)born through programmes for building experimental research infrastructures. Recently, I have expanded the scope of my research group into NFV and 5G networks. This brief account of my research trajectory justifies the following classification (details of the work may be found following the links):


Past Research (but not yet "dead")

The research work carried out in these topics has led to a number of tangible outputs. These outputs are the outcome of a painstakingly team work and they have taken the form of publications, projects, standards, and operational prototypes such as:

  • P2ner: An open source implementation of a P2P live streaming system (open source)
  • P2E: Patras Platforms for Experimentation, a cluster of experimental infrastructures accessible through our tools and available to third parties for experimentation

Being the outcome of a teamwork by now, we are currently extending the scope of the topics above into P2P video on demand, social networks, e-learning through more members and new research projects.

Research Projects


  • SMESEC, (Accepted and it will start in June 2017)
  • 5GinFIRE, Started 1/1/2017
  • CIPSEC, Started 1/6/2016



Selected Papers (to be updated soon)

This is a list of recent papers and some other related activities, representative of the current research of mine and of NAM group (complete list, NAM list).


Lampropoulos K., and S. Denazis, “Identity Management Directions in Future Internet”, IEEE Communications Magazine, December 2011.

Efthymiopoulos N., S. Tompros, A. Christakidis, K. Koutsopoulos,  and S. Denazis, "Enabling live video streaming services realization in telecommunication networks using P2P technology", Wiley International Journal of Communication Systems, Oct 2011, Vol. 24, Issue 10,pp. 1354-1374

Efthymiopoulos N., A. Christakidis, S. Denazis, and O. Koufopavlou, "Liquidstream – network dependent dynamic P2P live streaming", Springer Journal in Peer-to-Peer Networking and Applications, Mar 2011, Vol. 4, No 1, pp. 50-62

Wahle S., C. Tranoris, S. Denazis, A. Gavras, K. Koutsopoulos, and S. Tompros, «Emerging testing trends and the Panlab enabling infrastructure», IEEE Communications Magazine, March 2011

Christakidis A., N. Efthymiopoulos, J. Fiedler, S. Dempsey, K. Koutsopoulos, S. Denazis, S. Tombros, S. Garvey and O. Koufopavlou, "VITAL++ a new communication paradigm: embedding P2P technology in next generation networks", IEEE Communications Magazine, Jan 2011, Vol. 49, No 1, pp. 84-91

Dechouniotis D., N. Leontiou, X. A. Dimitropoulos, A. Kind, S.. Denazis, “Unveiling the underlying relationships over a network for monitoring purposes”, Int. Journal of Network Management 19(6): 513-526 (2009)

Kind A, X. Dimitropoulos, S. Denazis, and B. Claise, “Advanced Network Monitoring Brings Life to Awareness Plane”, IEEE Communications Magazine, October 2008


Dechouniotis, D., N. Leontiou, N. Athanasopoulos, G. Bitsoris, and S. Denazis “ACRA: A Unified Admission Control and Resource Control Framework for Virtualized Environments”, 8th International Conference on Network and Service Management CNSM 2012, Las Vegas, USA, 22-26 October 2012 (short paper)

Haleplidis E., S. Denazis, O. Koufopavlou, J. Halpern and J. Hadi Salim, “Software-Defined Networking: Experimenting with the control to forwarding plane interface - Extending the OpenFlow protocol with ForCES concepts”, European Workshop On Software Defined Networks, Darmstadt, Germany, 25-26 October, 2012.

Gkortsilas, I., K. Deltouzos, M. Efthymiopoulou, N. Efthymiopoulos, and S. Denazis. “Liquidstream - A high performance and stable scheduling architecture for P2P Video on Demand'”, TEMU2012, International Conference on Telecommunications and Multimedia, Heraklion, Crete, Greece, July 30 to August 01, 2012

Tranoris C., and S. Denazis, “Federation Computing: A pragmatic approach for the Future Internet”, 6th International Conference on Network and Service Management, CNSM 2010, Niagara Falls, Canada, October 2010, pp. 190-197

Leontiou N., D. Dechouniotis, and S. Denazis, “Adaptive admission control of distributed cloud services” 6th International Conference on Network and Service Management, CNSM 2010, Niagara Falls, Canada, October 2010,  pp. 318-321, (short paper)

Haleplidis E., C. Tranoris, S. Denazis, and O. Koufopavlou, “Adopting software engineering practices to network processor devices introducing the Domain Specific Modeling paradigm to the ForCES Framework”, 6th International Conference on Network and Service Management, CNSM 2010, Niagara Falls, Canada, October 2010, pp 366-369, (short paper)

Lampropoulos K., and S. Denazis, “DIMDS: A Cross Federation Identity Solution for Converged Networks”, GLOBECOM 2010: 1-6

Lampropoulos K., D. D. Sánchez, F. Almenares, P. Weik, and S. Denazis, “Introducing a cross federation identity solution for converged network environments”, IPTComm 2010: 1-11 (2010)

Lampropoulos K., S. Denazis, "DIMDS: a dynamic identity management and discovery system”, In Proceedings of the 28th IEEE international conference on Computer Communications Workshops (INFOCOM'09), April 20, 2009, Rio de Janeiro, Brazil

Lampropoulos K., S. Denazis, "A generic framework for a dynamic identity management and discovery system", In 5th International Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities and Workshops (TRIDENTCOM), April 6-8, 2009, Washington, DC, USA, pp 1-6,

Tranoris C., S. Denazis, and A. Gavras, “A workflow on the dynamic composition and distribution of orchestration for testbed provisioning”, International Conference on Ultra Modern Telecommunications, ICUMT 2009: 1-6, (2009)

Christakidis A., N. Efthymiopoulos, S. Denazis, and O. Koufopavlou, “On the architecture and the design of P2P live streaming system schedulers”, International Conference on Ultra Modern Telecommunications , ICUMT 2009: 1-8 (2009)

Christakidis A., N. Efthymiopoulos, S. Denazis, and O. Koufopavlou, “P2P-InfoReflect: Dynamic Locality-Aware and Multi-balanced Overlay for Network Dependent Applications and Services”, 2008 International Conference on High Performance Computing and Communications (HPCC-08): 929-934, China, (2008)

Koumoutsos G., S. Denazis, and K. Thramboulidis, “SLA e-Negotiations, Enforcement and Management in an Autonomic Environment”, in 3rd International Workshop on Modelling Autonomic Communications Environments, Samos, Greece, MACE 2008, Lecture Notes in Computer Science, LCNS 5276, Springer, pp 120-125 (2008)

Efthymiopoulos N., A. Christakidis, S. Denazis and O. Koufopavlou, “L-CAN: Locality Aware Structured Overlay for P2P Live Streaming”, in Management of Converged Multimedia Networks and Services (MMNS 2008), Samos, Greece, Lecture Notes in Computer Science, LNCS 5274, pp. 77-90 (2008)


“Modelling Autonomic Communications Environments”, Sven van der Meer, Mark Burgess, Spyros Denazis (eds.), Lecture Notes in Computer Science, LCNS 5276, Springer (2008)

“Active Networks: IFIP TC6 7th International Working Conference, IWAN 2005”, David Hutchison, Laurent Lefevre, Spyros Denazis (eds.), Lecture Notes in Computer Science, Vol. 4388, Springer (2008)

“Programmable Networks for IP Service Deployment”, Alex Galis, Spyros Denazis, Cornel Klein, Celestin Brou (eds.), Artech House Books (March 2004)


Haleplidis E., O. Koufopavlou, and S. Denazis, “Forwarding and Control Element Separation (ForCES) Implementation Experience”, IETF, Forward & Control Element Separation (FORCES) Working Group, RFC 6369

Lampropoulos K. (rapporteur), S. Denazis, S.F. Hervais, W. Steigerwald, and A.F. Gomez Skarmeta, “Study to Identify the need for a Global, Distributed Discovery Mechanism”, Identity and access management for Networks and Services (INS) Working Group, ETSI GS INS 006 V1.1.1 (2011-12)


“Programmable Networks Node Configuration for Performing Multiple Processes”, Toshiaki Suzuki, and Spyros Denazis.

Application Number: EP 02253575.1 filed on 21-May-2002
Publication No. EP 1365546 B1 published on 14-Dec-2005