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Research Seminar on 07.12.2022 16:00
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Fine Time Measurement based Time Synchronization for Multi-AP OFDMA Wireless Industrial Environments

Intermediate talk for Master's Thesis
Sugandh Huthanahally Mohan (Rute, Wiedner, Andre)

01.11.2022
18th International Conference on Network and Service Management (CNSM 2022)

PTP Security Measures and their Impact on Synchronization Accuracy

Authors: Filip Rezabek, Max Helm, Tizian Leonhardt, Georg Carle

01.10.2022
Proceedings of the 2022 Internet Measurement Conference

Towards a Tectonic Traffic Shift? Investigating Apple’s New Relay Network

Authors: Patrick Sattler, Juliane Aulbach, Johannes Zirngibl, Georg Carle

01.10.2022
Proceedings of the 2022 Internet Measurement Conference

Rusty Clusters? Dusting an IPv6 Research Foundation

Authors: Johannes Zirngibl, Lion Steger, Patrick Sattler, Oliver Gasser, Georg Carle

01.10.2022
18th International Conference on Network and Service Management (CNSM 2022)

Flow-level Tail Latency Estimation and Verification based on Extreme Value Theory

Authors: Max Helm, Florian Wiedner, Georg Carle

01.09.2022

Methodology and Infrastructure for TSN-based Reproducible Network Experiments

Time-Sensitive Networking (TSN) is a set of standards offering bounded latency and jitter, low packet loss, and reliability for Ethernet-based systems and allowing best-effort and real-time traffic to coexist. Domains that use TSN include intra-vehicular networks (IVNs), aerospace, professional audio-video solutions, and smart manufacturing. All these areas shift towards Ethernet due to its scalability, throughput, easy to develop applications, and affordability to produce in a large scale. In this work, we devise a methodology that introduces a workflow comprising several steps to assess TSN in various domains. The first step defines requirements and assesses which real-time traffic is present within a given domain. The second step focuses on configuration of a representative TSN-based network. The third step then evaluates the performance of different TSN standards in the chosen configuration(s). The final - optional - step supports optimizing the system to fulfill the identified requirements. The methodology is generalized by assessing the various TSN domains, finding their commonalities. As a result, we see the methodology can be applied to other TSN solutions. We provide a detailed case study for the domain of IVNs, from which the methodology is derived. We summarize the key requirements, systematically analyze IVNs traffic patterns for real-time and best effort traffic, and evaluate the performance of crucial TSN standards recommended by the 802.1DG Automotive Profile. The methodology builds on top of infrastructure framework, EnGINE, that offers an environment for reproducible and scalable TSN experiments and relies on commercial off the shelf hardware and open-source solutions. The framework allows to evaluate various standards and identify suitable topologies with focus on Layer 2 solutions. Using EnGINE, we evaluated the various traffic patterns and their corresponding TSN configurations and identified if and how the IVN requirements can be fulfilled.

Authors: Marcin Bosk*, Filip Rezabek*, Kilian Holzinger, Angela G. Marino, Francesc Fons, Abdoul A. Kane, Jörg Ott, Georg Carle

01.09.2022

EnGINE: Flexible Research Infrastructure for Reliable and Scalable Time Sensitive Networks

Self-driving and multimedia systems have common implications: increased demand on network bandwidth and computation nodes. To cope with the current and future challenges, intra-vehicular networks (IVNs) change their layout. They are built around powerful central nodes connected to the rest of the vehicle via Ethernet. The usage of Ethernet presents a challenge, as it by design lacks support for deterministic behavior, which is crucial for real-time systems. Therefore, the IEEE Time-Sensitive Networking (TSN) task group offers standards introducing low-latency and deterministic communication into Ethernet based networks allowing coexistence of best-effort and real-time traffic. To understand the coexistence challenges, these new networked systems need to be thoroughly evaluated with IVN requirements in mind. To assess various topologies, configurations, and data traffic types in IVN setups, we introduce Environment for Generic In-vehicular Networking Experiments—EnGINE. It allows, among many others, repeatable, reproducible, and replicable TSN experiments with high precision and flexibility. EnGINE is based on commercial off-the-shelf hardware and uses the flexible Ansible framework for experiment orchestration. This allows us to configure various topologies emulating realistic behavior of IVNs or other time sensitive systems used, e.g., in industrial automation. Obtaining such realism is challenging using simulations. Based on available related work, we further address the challenges found in those networks, especially IVNs. We derive TSN domain framework requirements, provide details on design decisions for the EnGINE, and present results to show its capabilities. The results present relevant network metrics based on collected data. A key focus is on the experiment campaigns realism achieved by real IVNs’ data footage and the OS optimizations to offer real-time behavior. We believe that EnGINE provides the ideal environment for TSN experiments from different domains.

Authors: Filip Rezabek*, Marcin Bosk*, Thomas Paul, Kilian Holzinger, Sebastian Gallenmüller, Angela Gonzalez, Abdoul Kane, Francesc Fons, Zhang Haigang, Georg Carle, Jörg Ott

01.08.2022
ACM SIGCOMM 2022 Workshop on 5G and Beyond Network Measurements, Modeling, and Use Cases (5G-MeMU ’22)

Slicing Networks with P4 Hardware and Software Targets

Authors: Eric Hauser, Manuel Simon, Henning Stubbe, Sebastian Gallenmüller, Georg Carle

01.07.2022
DroNet ’22: Proceedings of the Eighth Workshop on Micro Aerial Vehicle Networks, Systems, and Applications

Policy-Based Routing for Flying Adhoc Networks

Authors: Florian Wiedner, Jonas Andre, Paulo Mendes, Georg Carle

01.07.2022
KuVS Fachgespräch - Würzburg Workshop on Modeling, Analysis and Simulation of Next-Generation Communication Networks 2022 (WueWoWas’22)

Reproducible by Design: Network Experiments with pos

Authors: Sebastian Gallenmüller, Dominik Scholz, Henning Stubbe, Eric Hauser, Georg Carle

01.06.2022
Proc. Network Traffic Measurement and Analysis Conference (TMA)

Active TLS Stack Fingerprinting: Characterizing TLS Server Deployments at Scale

Active measurements can be used to collect server characteristics on a large scale. This kind of metadata can help discovering hidden relations and commonalities among server deployments offering new possibilities to cluster and classify them. As an example, identifying a previously-unknown cybercriminal infrastructures can be a valuable source for cyber-threat intelligence. We propose herein an active measurement-based methodology for acquiring Transport Layer Security (TLS) metadata from servers and leverage it for their fingerprinting. Our fingerprints capture the characteristic behavior of the TLS stack primarily caused by the implementation, configuration, and hardware support of the underlying server. Using an empirical optimization strategy that maximizes information gain from every handshake to minimize measurement costs, we generated 10 general-purpose Client Hellos used as scanning probes to create a large database of TLS configurations used for classifying servers. We fingerprinted 28 million servers from the Alexa and Majestic toplists and two Command and Control (C2) blocklists over a period of 30 weeks with weekly snapshots as foundation for two long-term case studies: classification of Content Delivery Network and C2 servers. The proposed methodology shows a precision of more than 99 % and enables a stable identification of new servers over time. This study describes a new opportunity for active measurements to provide valuable insights into the Internet that can be used in security-relevant use cases.

Authors: Markus Sosnowski, Johannes Zirngibl, Patrick Sattler, Georg Carle, Claas Grohnfeldt, Michele Russo, Daniele Sgandurra

04.08.2022
TUM ACE SUPPRA Project

TUM Research Groups Selected as Global Winners for Blockchain and Education Program offered by Algorand Foundation

The Algorand protocol [1] is a carbon-zero Layer 1 Blockchain technology, founded by the Turing Award winner and MIT professor Silvio Micali. Based on pure Proof-of-Stake (POS) consensus, Algorand currently supports 1000 ...

29.06.2022
TMA'22: Best Paper Award

Best Paper Award at TMA 2022

Our publication "Active TLS Stack Fingerprinting: Characterizing TLS Server Deployments at Scale" has been awarded with the Best Paper Award at the Network Traffic Measurement and Analysis Conference (TMA 2022).

The publication is a collaboration with Claas Grohnfeldt, Michele ...

13.01.2020
CCNC'20: Best Demo Award

Best Demo Award at CCNC 2020

Our demo of NCSbench has been awarded the Best Demo Award at the IEEE Consumer Communications and Networking Conference (CCNC'20) in Las Vegas, Nevada, USA.

The demo presented NCSbench a platform consisting of a networked control system (NCS) and ...

24.09.2019
ANCS'19: Best Paper Award

Best Paper Award at ANCS 2019

Our publication The Case for Writing Network Drivers in High-Level Programming Languages has been awarded with the Best Paper Award at the ACM/IEEE Symposium on Architectures for Networking and Communications Systems (ANCS'19) in Cambridge, United Kingdom.

The publication ...

29.03.2019
PAM'19: Best Dataset Award

Best Dataset Award at PAM 2019

The publication "A First Look at QNAME Minimization in the Domain Name System" has been awarded with the Best Dataset Award at the Passive and Active Measurement (PAM) Conference (PAM'19).

The publication is an international collaboration with Wouter B. ...