Dr.-Ing. Rhaban Hark

Phone: +49 (0) 6151 16 20851

E-Mail: Rhaban.Hark@...

ORCiD: 0000-0003-1799-0023


Head of the Adaptive Communication Systems Group

Rhaban Hark received the master’s degree in electrical engineering and the master's degree in information system technology both in 2015 at the Technical University of Darmstadt with the thesis "Dynamic and Transparently Discoverable Software-Defined Multicast in ISP Environments". Since 2015 he is a Research Assistant with the Multimedia Communications Engineering Lab, Technical University of Darmstadt. In 2019 he received his Dr.-Ing. at the Technische Universität Darmstadt with the dissertation titled "Monitoring Federated Softwarized Networks: Approaches for Efficient and Collaborative Data Collection in Large-Scale Software-Defined Networks." His current research focuses on distributed monitoring approaches in the context of Software-Defined Networks.

Research Interests

  • Collaborative monitoring in federated Software-defined Networks (SDNs)

    • Information sharing on the control plane (inter- & intra-domain)
    • Application-driven selection of relevant network state information
    • Intelligent and dynamic selection of measurement techniques and points

  • Data-plane programming to add push monitoring functionality to switches


SENDATE-PLANETS TITAN (SEcure Networking for a DATa Center Cloud in Europe)

Rhaban Hark is working within the SENDATE-PLANETS project funded by the German Federal Ministry of Education and Research. He is part of the TITAN subproject with its focus on distributed and flexible network status detection.

The SENDATE-PLANETS was evaluated with excellent results.

MAKI (Multi-Mechanismen Adaption für das zukünftige Internet)

Rhaban Hark is associated with the Collaborative Research Center 1053 - MAKI funded by the DFG and works towards transitions between monitoring mechanisms in the context of Software-defined Networking.


  • [KNB+20] Ralf Kundel, Leonhard Nobach, Jeremias Blendin, Wilfried Maas, Andreas Zimber, Hans-Joerg Kolbe, Georg Schyguda, Vladimir Gurevich, Rhaban Hark, Boris Koldehofe, Ralf Steinmetz: OpenBNG: Central office network functions on programmable data plane hardware. In: International Journal of Network Management, p. 25, August 2020. http://dx.doi.org/10.1002/nem.2134.
  • [HTRS19-1] Rhaban Hark, Khalil Tounsi, Amr Rizk, Ralf Steinmetz: Decentralized Collaborative Flow Monitoring in Distributed SDN Control-Planes. In: GI/ITG Conference on Networked Systems (NetSys'19), p. 1-8, IEEE, March 2019. http://www.netsys2019.org/accepted_papers/.
  • [HAH+18] Rhaban Hark, Nieke Aerts, David Hock, Nils Richerzhagen, Amr Rizk, Ralf Steinmetz: Reducing the Monitoring Footprint on Controllers in Software-defined Networks. In: IEEE Transactions on Network and Service Management (TNSM), Special Issue on Novel Techniques for Managing Softwarized Networks, p. 1-13, October 2018. ISSN 1932-4537. https://ieeexplore.ieee.org/document/8496803.
  • [HGK+18] Rhaban Hark, Mohamed Ghanmi, Sounak Kar, Nils Richerzhagen, Amr Rizk, Ralf Steinmetz: Representative Measurement Point Selection to Monitor Software-defined Networks. In: The 43nd IEEE Conference on Local Computer Networks (LCN), p. 1-8, IEEE, October 2018. https://www.ieeelcn.org/Program_technical.html.
  • [KHRS18] Sounak Kar, Rhaban Hark, Amr Rizk, Ralf Steinmetz: Towards Optimal Placement of Monitoring Units in Time-varying Networks under Centralized Control. In: Reinhard German, Kai-Steffen Hielscher, Udo R. Krieger (Eds.): Measurement, Modelling and Evaluation of Computing Systems, Lecture Notes in Computer Science: 10740, No. 19, p. 99-112, Springer, February 2018. ISBN 978-3-319-74946-4.
  • [HRR+17] Rhaban Hark, Nils Richerzhagen, Björn Richerzhagen, Amr Rizk, Ralf Steinmetz: Towards an Adaptive Selection of Loss Estimation Techniques in Software-defined Networksfor. In: IFIP: Proc. 16th IFIP Networking 2017 Conference (NETWORKING'17), IEEE, June 2017. ISBN 978-3-901882-94-4.
  • [HRR+17-2] Rhaban Hark, Amr Rizk, Nils Richerzhagen, Björn Richerzhagen, and Ralf Steinmetz: Isolated In-Band Communication for Distributed SDN Controllers. In: IFIP: Proc. 16th IFIP Networking 2017 Conference and Workshops: IFIP/TC6 Networking Poster and Demo Session, p. 1-2, IEEE, June 2017. ISBN 978-3-901882-94-4.
  • [RRH+16-2] Nils Richerzhagen, Björn Richerzhagen, Rhaban Hark, Dominik Stingl, Andreas Mauthe, Alberto E. Schaeffer-Filho, Klara Nahrstedt, Ralf Steinmetz: Adaptive Monitoring for Mobile Networks in Challenging Environments. In: Kewei Sha, Aaron Striegel, Min Song: Advances in Computer Communications and Networks: From Green, Mobile, Pervasive Networking to Big Data Computing, River Publishers Series in Communications, December 2016. ISBN 9788793379879.
  • [RBHH16] Julius Rückert, Jeremias Blendin, Rhaban Hark, David Hausheer: Flexible, Efficient, and Scalable Software-Defined Over-the-Top Multicast for ISP Environments with DynSDM. In: IEEE Transactions on Network and Service Management (TNSM), vol. 13, no. 4, p. 754-767, December 2016. https://doi.org/10.1109/TNSM.2016.2607281.
  • [RRL+16] Nils Richerzhagen, Björn Richerzhagen, Michal Lipinski, Markus Weckesser, Roland Kluge, Rhaban Hark, Ralf Steinmetz: Exploring Transitions in Mobile Network Monitoring in Highly Dynamic Environments. In: Demonstrations of the 41st IEEE Conference on Local Computer Networks (LCN Demonstrations), p. 1-3, IEEE, November 2016. http://www.ieeelcn.org/lcn41demos/RicherzhagenN.pdf.
  • [RRS+16] Björn Richerzhagen, Nils Richerzhagen, Sophie Schönherr, Rhaban Hark, Ralf Steinmetz: Stateless Gateways - Reducing Cellular Traffic for Event Distribution in Mobile Social Applications. In: Proc. Int. Conf. on Computer Communication and Networks (ICCCN), p. 1-9, IEEE, August 2016. ISBN 978-1-5090-2279-3.
  • [RRH+16] Nils Richerzhagen, Björn Richerzhagen, Rhaban Hark, Dominik Stingl, Ralf Steinmetz: Limiting the Footprint of Monitoring in Dynamic Scenarios through Multi-dimensional Offloading. In: Proc. Int. Conf. on Computer Communication and Networks (ICCCN), p. 1-9, IEEE, August 2016. ISBN 978-1-5090-2279-3/16.
  • [RWRH16] Björn Richerzhagen, Alexander Wagener, Nils Richerzhagen, Rhaban Hark, Ralf Steinmetz: A Framework for Publish/Subscribe Protocol Transitions in Mobile Crowds. In: Proc. 10th International Conference on Autonomous Infrastructure, Management and Security (AIMS 2016), vol. Volume 9701 of the series Lecture Notes in Computer Science, p. 16-29, Springer International Publishing, June 2016. ISBN 978-3-319-39814-3. http://doi.org/10.1007/978-3-319-39814-3_2.
  • [HSR+16] Rhaban Hark, Dominik Stingl, Nils Richerzhagen, Klara Nahrstedt, Ralf Steinmetz: DistTM: Collaborative Traffic Matrix Estimation in Distributed SDN Control Planes. In: IFIP: Proc. 15th IFIP Networking 2016 Conference (NETWORKING'16), p. 82-90, IEEE, May 2016. ISBN 978-3-901882-83-8. http://dl.ifip.org/db/conf/networking/networking2016/.
  • [RBHH15] Julius Rückert, Jeremias Blendin, Rhaban Hark, David Hausheer: DynSDM: Dynamic and Flexible Software-Defined Multicast for ISP Environments. In: International Conference on Network and Service Management (CNSM), p. 117 - 125, IEEE, November 2015. ISBN 978-3-9018-8278-4. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7367347&tag=1.