Hi,
I'm Lars,
a novice scientist,
discussion enthusiast,
& cottage cheese lover.
Contact Me
discussion enthusiast,
& cottage cheese lover.
I'm a last-year Ph.D. student interested in routing, traffic engineering, and congestion control. I work in Anja Feldmann's group at the Max Planck Institute for Informatics in Saarbrücken and plan to finish my Ph.D. in late 2022. My research combines the quantitive analysis of longitudinal data with active probing campaigns to provide new insights into long-standing research topics. A continuous discourse with network operators allows me to contextualize the implications and importance of my findings and guides me towards new, exciting research endeavors.
Since my second year at the university, I continuously taught younger students. While I started by tutoring 30-40 students on data structures, algorithms, and networking, I recently co-organized multiple networking-related courses for more than 150 students and co-supervised the bachelor or master theses of six students.
After my Ph.D., I look for opportunities to strengthen my current expertise in routing and measurements while extending my knowledge of systems engineering, machine learning, and data analytics. If you think I could be a good match for your team, please don't hesitate to ping me!
Resume
Publications
Kirin: Hitting the Internet with Millions of Distributed IPv6 Announcements
L. Prehn, P. Foremski, and O. Gasser
Currently under Submission.
PreprintHyper-Specific Prefixes: Gotta Enjoy the Little Things in Interdomain Routing
K. Z. Sediqi, L. Prehn, and O. Gasser
ACM SIGCOMM Computer Communication Review 52.2 (2022): 20-34.
PDFPeering Only? Analyzing the Reachability Benefits of Joining Large IXPs Today
L. Prehn, F. Lichtblau, C. Dietzel, and A. Feldmann
International Conference on Passive and Active Network Measurement (pp. 338-366), 2022.
PDF VideoHow biased is our Validation (Data) for AS Relationships?
L. Prehn and A. Feldmann
Proceedings of the ACM Internet Measurement Conference (pp. 612-620), 2021.
PDF VideoWhen Wells Run Dry: The 2020 IPv4 Address Market
L. Prehn, F. Lichtblau, and A. Feldmann
Proceedings of the 16th International Conference on emerging Networking EXperiments and Technologies (pp. 46-54), 2020.
PDF VideoAS-Path Prepending: there is no rose without a thorn
P. Marcos, L. Prehn, L. Leal, A. Dainotti, A. Feldmann, and M. Barcellos
Proceedings of the ACM Internet Measurement Conference (pp. 506-520), 2020.
PDF VideoReviewing Experience & Service
TPC Member
Shadow TPC Chair
Anja and I organized the Shadow TPC excercise.
Student Organizer
Amanda and I organized the Student Welcoming Session.
Member of Artifact Evaluation Commitee
Student Scribe
during the virtual PC meeting.
Shadow PC Exercise
with an in-person Shadow PC meeting in London.
Education & Experience
Ph.D. Student
Max-Planck-Institut für Informatik
Under the guidance of Anja Feldmann, I'm working on topics related to Interdomain routing and its building blocks. More specifically, my current projects aim at better understanding spoofing detection mechanisms, scrubbing service operations, the possibilities of large peering infrastructures, and the enhancement of the route collector infrastructure.
SWE Intern
Google Zurich
I developed a highly configurable visualization layer that enables network acquisition, construction, and planning teams to quickly gain actionable insights into improvement areas within Google's optical fleet.
M.Sc. in Computer Science
Technische Universität Berlin
B.Sc. in Computer Science
Technische Universität Berlin
Teaching
Teaching Assistant
Max-Planck-Institut für Informatik
I co-organized Anja Feldmann's seminar "Hot Topics in Data Networks."
Teaching Assistant
Max-Planck-Institut für Informatik
I co-organized Anja Feldmann's course "Data Networks."
Student Assistant
Technische Universität Berlin
In Anja Feldmann's course "Network Protocols and Architectures," I assisted the grading for weekly assignments and helped to prepare the exam.
Student Assistant
Technische Universität Berlin
In Oliver Brock's course "Algorithms and Data Structures," I presented tutorials to two small groups of about 40 students every week.
Lab Assistant
Technische Universität Berlin
I co-organized and instructed lab sessions as well as graded the bi-weekly assignments for the lab that accompanies Adam Wolisz's "Network Technologies" lecture.
Student Assistant
Technische Universität Berlin
In Oliver Brock's course "Algorithms and Data Structures", I presented tutorials to two small groups of about 30 students every week.
Get in touch
Saarland Informatics Campus
Campus E1 4
66123 Saarbrücken
Germany