Dr.-Ing. Marc Werner

Contact Information

Offered Theses Topics

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  2016 Completed

Secure Context Migration between IEEE 802.11 Networks

Supervisor: Marc Werner

  2016 Completed

Design and Implementation of a Service-Oriented Architecture for Large-Scale Testbed Management

Supervisor: Marc Werner

Description Wireless Multihop Network testbeds are often distributed over large physical areas and have many devices which renders management challenging. A multitude of diverse frameworks are available to assist in the management of such testbeds. Properties like scalability, heterogeneous hardware support and effortless testbed configuration are a self-evident goal for these frameworks. However, this combination is hard to achieve and the exact requirements vary for different testbeds. Instead of providing a completely new and tailored experimentation framework, I propose Panopticon, a service oriented management framework, providing a lower layer to intercept and improve existing functionality. It slices large, distributed testbeds into dynamically sized subunits, offering a granular choice in testbed experimentation frameworks for every slice. Such an exper- imentation framework can be selected regarding the exact experiment’s requirements and not as a compromise between all available testbed components. Panopticon’s list of services can be extended, offering simple entry points for new, custom implementations. It is a framework federating network enabled infrastructures.

  2016 Completed

Enabling Seamless Transitions betweegn Cyrptographically Secured

Supervisor: Marc Werner

  2015 Completed

Secure Transitions

Supervisor: Marc Werner

  2014 Completed

Network ID: Self-Provisioning Service Proxy

Supervisor: Marc Werner

Publications

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  2017  Technische Universität Darmstadt Darmstadt PhD thesis

Utilizing Advanced Network Context to Optimize Software-Defined Networks

Marc Werner

PDF BibTeX

Abstract
Legacy network systems and protocols are mostly static and keep state information in silo-style storage, thus making state migration, transformation and re-use difficult. Software-Defined Network (SDN) approaches in unison with Network Function Virtualization (NFV) allow for more flexibility, yet they are currently restricted to a limited set of state migration options. Additionally, existing systems and protocols are mostly tailored to meet the requirements of specific application scenarios. As a result, the protocols cannot easily be adapted to novel application demands, organically growing networks, etc. Impeding the sharing of networking and system state, along with lacking support for dynamic transitions between systems and protocols, severely limits the ability to optimally manage resources and dynamically adapt to a desirable overall configuration. These limitations not only affect the network performance but also hinder the deployment of new and innovative protocols as a hard break is usually not feasible and thus full support for legacy systems is required. On the one hand, we propose a generalized way to collect, store, transform, and share context between systems and protocols in both the legacy Internet as well as NFV/SDN-driven networks. This allows us to share state information between multiple systems and protocols from NFs over BGP routers to protocols on all layers of the network stack. On the other hand, we introduce an architecture for designing modular protocols that are built with transition in mind. We argue that the modular design of systems and protocols can remove the key limitations of today’s monolithic protocols and allow for a more dynamic network management. First, we design and implement a Storage and Transformation Engine for Advanced Net- working context (STEAN) which constitutes a shared context storage, making network state information available to other systems and protocols. Its pivotal feature is the ability to allow for state transformation as well as for persisting state to enable future re-use. Second, we provide a Blueprint for Switching Between Mechanisms that serves as a framework and guideline for developers to standardize and ease the process of designing and implementing systems and protocols that support transitions as a first order principle. By means of experimentation, we show that our architecture covers a diverse set of challenging use cases in legacy systems—such as Wireless Multihop Networks (WMNs)—as well as in NFV/SDN-enabled systems. In particular, we demonstrate the feasibility of our approach by migrating state information between two instances of the PRADS NF in a virtualized Mininet environment, and show that our solution outperforms state of the art frameworks that are specifically built for NF migration. We further demonstrate that a dynamic switch between WMN routing protocols is possible at runtime and that the state information can be reutilized for bootstrapping novel protocol modules, thus minimizing the control overhead.

  2016  IFIP Networking Conference (IFIP Networking) Conference

STEAN: A Storage and Transformation Engine for Advanced Networking Context

Marc Werner Johannes Schwandke Matthias Hollick Oliver Hohlfeld Torsten Zimmermann Klaus Wehrle

BibTeX DOI: 10.1109/IFIPNetworking.2016.7497203

Abstract
Legacy Internet systems and protocols are mostly static and keep state information in silo-style storage, thus making state migration, transformation and re-use difficult. Software Defined Networking (SDN) approaches in unison with Network Functions Virtualization (NFV) allow for more flexibility, yet they are currently restricted to a limited set of state migration options. Impeding the sharing of networking and system state severely limits the ability to optimally manage resources and dynamically adapt to a desirable overall configuration. We propose a generalized way to collect, store, transform, and share context between NFs in both the legacy Internet and NFV/SDN-driven systems. To this end, we design and implement a Storage and Transformation Engine for Advanced Networking Context (STEAN), which constitutes a shared context storage, making network state information available to other systems and protocols. Its pivotal feature is the ability to allow for state transformation as well as for persisting state to enable future re-use. By means of experimentation, we show that STEAN covers a diverse set of challenging use cases in legacy systems as well as in NFV/SDN-enabled systems.

  2014  1st KuVS Workshop on Anticipatory Networks Conference

Mind the Gap – Understanding the Traffic Gap when Switching Communication Protocols

Marc Werner Tobias Lange Matthias Hollick Torsten Zimmermann Klaus Wehrle

BibTeX

Abstract
A large variety of routing protocols for Wireless Multihop Networks exists today. These protocols are tailored towards a specific networking scenario and cannot be easily adapted to suit the changing requirements of novel applications, organically growing networks, etc. Introducing a modular design allowing for dynamic switching between routing mechanisms is a promising approach to overcome this challenge. However, in the transition phase between mechanisms, a gap in network traffic can occur while the new protocol is initialized, thus effectively leaving the network disconnected. The resulting service interruption decreases the user experience and violates the quality of service requirements of, for example, multimedia applications such as Voice over IP. In this paper, we perform a measurement study to analyze the characteristic effects of switching between routing mechanisms on a wireless mesh testbed. Specifically, we analyze the switch between a link state and a distance vector routing mechanisms. The obtained results allow for identifying some key factors affecting the transition between mechanism.

  2013   Essener Workshop Neue Herausforderungen in der Netzsicherheit Conference

Not the Enemy but the Ally: Increasing the Security of Wireless Networks Using Smartphones (extended abstract)

Rodrigo do Carmo Marc Werner Paul Klobuszenski Matthias Hollick

BibTeX

  2012  Proceedings of the 2nd IFIP Conference on Sustainable Internet and ICT for Sustainability (SustainIT) Conference

On the Accuracy of Appliance Identification Based on Distributed Load Metering Data.

Andreas Reinhardt Peter Baumann D. Burgstahler Matthias Hollick H. Chonov Marc Werner R. Steinmetz

BibTeX

Abstract
Dynamic load management, i.e., allowing electricity utilities to remotely turn electric appliances in households on or off, represents a key element of the smart grid. Appliances should however only be disconnected from mains when no negative side effects, e.g., loss of data or thawing food, are incurred thereby. This motivates the use of appliance identification techniques, which determine the type of an attached appliance based on the continuous sampling of its power consumption. While various implementations based on different sampling resolutions have been presented in existing literature, the achievable classification accuracies have rarely been analyzed. We address this shortcoming and evaluate the accuracy of appliance identification based on the characteristic features of traces collected during the 24 hours of a day. We evaluate our algorithm using more than 1,000 traces of different electrical appliances' power consumptions. The results show that our approach can identify most of the appliances at high accuracy.