Authors

Matthias Wählisch

Based in Berlin, Germany

4

Articles

49

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About the author

Matthias is a professor and holds the Chair of Distributed and Networked Systems at the Faculty of Computer Science at TU Dresden. His research and teaching focus on efficient, reliable, and secure Internet communication. This includes the design and evaluation of networking protocols and architectures, as well as Internet measurements and analysis. His efforts are driven by the hope of improving Internet communication based on sound research. He is actively involved in the IETF since 2005, co-founded some successful open source projects such as RIOT (https://riot-os.org/) and RTRlib (https://rtrlib.rpki.net/), and is a member of the Board of Advisors of BCIX.

Should You Update Your Route Flap Damping Parameters?

Should You Update Your Route Flap Damping Parameters?

9 min read

BGP Route Flap Damping (RFD) is recommended to suppress BGP churn. Default RFD configurations in routers have been shown to be harmful. Current configuration recommendations by the IETF and RIPE, however, are based on a study from 2010 which focused on IPv4 only. This article presents our recent me…

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Route Flap Damping in the Wild?!

Route Flap Damping in the Wild?!

9 min read

BGP Route Flap Damping (RFD) and its use has been a controversial topic in the past. Recommendations have been revised multiple times over the past two decades and still differ from vendor default values. In this article we dive into how we measured Route Flap Damping in the real-world, uncover whi…

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Down the Black Hole: Dismantling Operational Practices of BGP Blackholing at IXPs

Down the Black Hole: Dismantling Operational Practices of BGP Blackholing at IXPs

8 min read

Large Distributed Denial-of-Service (DDoS) attacks pose a major threat not only to end systems but also to the Internet infrastructure as a whole. Remote Triggered Black Hole filtering (RTBH) has been established as a tool to mitigate inter-domain DDoS attacks. The idea is simple: Signal special BG…

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Measuring the Adoption of RPKI Route Origin Validation

Measuring the Adoption of RPKI Route Origin Validation

10 min read

The number of Resource Certificates and ROAs is steadily growing, especially in the RIPE NCC service region. However, it remains unclear how widely BGP speakers on the Internet are actually using route origin validation (ROV) to drop or de-preference invalid announcements.

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