Constantin Sander, M.Sc.

Constantin Sander, M.Sc.

Researcher

Ahornstraße 55, building E3 52074 Aachen Germany
9031
+49 241 80-21428
constantin.sander@comsys.rwth-aachen.de

Short CV

Biography
Since November 2019, I am a researcher and Ph.D. student at the Chair of Communication and Distributed Systems. Before, I graduated with an M.Sc. in Computer Science at RWTH Aachen University.

Research
Being part of the Network Architectures Group, my research interests focus on but are not limited to the optimization of modern network protocols such as QUIC and HTTP/3. This research involves analyzing the current use and adoption of these protocols via Internet measurements, their current performance and how to develop novel mechanisms to optimize this performance in the long run.

Supervision of Theses
I am supervising Bachelor’s and Master’s Theses in the areas of Internet measurements and performance/optimization of modern web protocols. If you are interested in these topics, have a look at my publications to identify a specific topic that suits your interests best and send me an email.

Publications

Ike Kunze, Constantin Sander, Mike Kosek, Lars Tissen, Jan Pennekamp, Klaus Wehrle. Congestion-Responsive Queuing for Internet Flows. Proceedings of the 2025 IEEE/IFIP Network Operations and Management Symposium (NOMS ‘25), May 12 - May 16, 2025, Honolulu, HI, USA. May 2025.
PDF Cite GitHub
Constantin Sander, Ike Kunze, Dario Veltri, Klaus Wehrle. VGPrio: Visually-Guided HTTP/3 Prioritization. Proceedings of the 2025 IFIP Networking Conference (NETWORKING 2025), May 26 - May 29, 2025, Limassol, Cyprus. May 2025.
Cite
Ike Kunze, Constantin Sander, Lars Tissen, Benedikt Bode, Klaus Wehrle. SpinTrap: Catching Speeding QUIC Flows. Proceedings of the 2024 IEEE/IFIP Network Operations and Management Symposium (NOMS ‘24), May 6 - May 10, 2024, Seoul, Korea, Republic of. May 2024.
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Ike Kunze, Constantin Sander, Klaus Wehrle. Does It Spin? On the Adoption and Use of QUIC’s Spin Bit. Proceedings of the 2023 Internet Measurement Conference (IMC ‘23), Montreal, Canada. October 2023.
PDF Cite DOI Zenodo
Constantin Sander, Ike Kunze, Leo Blöcher, Mike Kosek, Klaus Wehrle. ECN with QUIC: Challenges in the Wild. Proceedings of the Internet Measurement Conference (IMC ‘23), Montreal, Canada. October 2023.
PDF Cite DOI GitHub GitHub GitHub arXiv
Markus Dahlmanns, Constantin Sander, Robin Decker, Klaus Wehrle. Secrets Revealed in Container Images: An Internet-wide Study on Occurrence and Impact. Proceedings of the 2023 ACM Asia Conference on Computer and Communications Security (ASIACCS ‘23), Jul 10 - Jul 14, 2023, Melbourne, VIC, Australia. July 2023.
PDF Cite DOI GitHub
Laurenz Grote, Ike Kunze, Constantin Sander, Klaus Wehrle. Instant Messaging Meets Video Conferencing: Studying the Performance of IM Video Calls. Proceedings of the Network Traffic Measurement and Analysis Conference (TMA ‘23), Jun 26 - Jun 29, 2023, Naples, Italy. June 2023.
PDF Cite DOI Zenodo Top-3 Paper
Constantin Sander, Ike Kunze, Klaus Wehrle. Analyzing the Influence of Resource Prioritization on HTTP/3 HOL Blocking and Performance. Proceedings of the Network Traffic Measurement and Analysis Conference (TMA ‘22), Enschede, Netherlands. June 2022.
PDF Cite GitHub GitHub tma.ifip.org
Ike Kunze, Constantin Sander, Klaus Wehrle, Jan Rüth. Tracking the QUIC Spin Bit on Tofino. Proceedings of the 2021 Workshop on Evolution, Performance and Interoperability of QUIC (EPIQ ‘21), Virtual Event Germany. December 2021.
PDF Cite DOI GitHub
Constantin Sander, Leo Blöcher, Klaus Wehrle, Jan Rüth. Sharding and HTTP/2 Connection Reuse Revisited: Why Are There Still Redundant Connections?. Proceedings of the Internet Measurement Conference (IMC ‘21), Virtual Event. November 2021.
PDF Cite DOI arXiv
Constantin Sander, Ike Kunze, Klaus Wehrle, Jan Rüth. Video Conferencing and Flow-Rate Fairness: A First Look at Zoom and the Impact of Flow-Queuing AQM. Proceedings of the Passive and Active Measurement Conference (PAM ‘21). March 2021.
PDF Cite DOI arXiv
Constantin Sander, Jan Rüth, Oliver Hohlfeld, Klaus Wehrle. DeePCCI: Deep Learning-based Passive Congestion Control Identification. In Proceedings of the ACM SIGCOMM Workshop on Network Meets AI & ML (NetAI ‘19), Aug 23 - Aug 23, 2019, Beijing, China. August 2019.
PDF Cite DOI arXiv

Advised Theses

Please note that ongoing theses are only visible from within the RWTH network. If you are not affiliated with RWTH Aachen University and you are interested in our topics, please contact us.

Room Occupancy Estimation and Queue Length Prediction from Wireless Traces
Bachelor's Thesis, RWTH Aachen University, September 2024
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Stefan Decker (i5)
A Topic in Network Technology
Master's Thesis, RWTH Aachen University, September 2024
Advisors: Mirja Kühlewind (Ericsson), Constantin Sander, Ike Kunze
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Master's Thesis, RWTH Aachen University, August 2024
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Bachelor's Thesis, RWTH Aachen University, May 2024
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Master's Thesis, RWTH Aachen University, January 2024
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Measuring the Prevalence of TLS SNI on the Internet
Bachelor's Thesis, RWTH Aachen University, November 2023
Advisors: Markus Dahlmanns, Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Bachelor's Thesis, RWTH Aachen University, September 2023
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Comparison of Quicv1 and TCP network performance characteristics using ns3
Master's Thesis, RWTH Aachen University, July 2023
Advisors: Constantin Sander, Ike Kunze
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Master's Thesis, RWTH Aachen University, January 2023
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
ECN in the Modern Internet: Capabilities, Usage and Impairments
Master's Thesis, RWTH Aachen University, November 2022
Advisors: Constantin Sander, Ike Kunze
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Geographically Visualizing Active Internet Measurements
Bachelor's Thesis, RWTH Aachen University, November 2022
Advisors: Markus Dahlmanns, Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Master's Thesis, RWTH Aachen University, September 2022
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
Investigating Congestion Control Traits of Mobile Video Conferencing Applications
Bachelor's Thesis, RWTH Aachen University, April 2022
Advisors: Constantin Sander, Ike Kunze
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
On the Occurence of Confidential Security Material in Docker Images
Bachelor's Thesis, RWTH Aachen University, October 2021
Advisors: Markus Dahlmanns, Constantin Sander
Examiners: Klaus Wehrle, Ulrike Meyer (IT-Sec)
A Topic in Network Architectures
Bachelor's Thesis, RWTH Aachen University, September 2021
Advisor: Constantin Sander
Examiners: Klaus Wehrle, Bernhard Rumpe (i3)
A Topic in Network Architectures
Bachelor's Thesis, RWTH Aachen University, December 2020
Advisors: Constantin Sander, Jan Rüth
Examiners: Ulrike Meyer (IT-Sec), Klaus Wehrle