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Slow network, fast money: How Deutsche Telekom breaks the internet (denog17)
In Europe, net neutrality is a principle enshrined in EU law which states that all data on the internet should be treated equally - but what happens when large providers such as Deutsche Telekom systematically violate it with their interconnection practices? The Netzbremse project documents an alarming case: millions of Deutsche Telekom customers are experiencing artificial throttling of their connection because Telekom refuses to expand its peering capacities appropriately. As the only internet provider in Germany, users and network operators have to pay at both ends of the line to avoid congestion. The result: massive quality...
You can’t just model a train in Netbox: About Architecting and running modern IT Infrastructure in Trains (denog17)
At DB Fernverkehr, we are running some IT Infrastructure on a large fleet of ICE Trains. In the past, there was only WIFI for the passengers, and many systems were handled as “embedded systems”. Nowadays, more aspects of “modern IT infrastructure” are part of the IT in trains, providing additional services like passenger information. This talk gives a quick introduction of what is happening on the trains, as well as some of the challenges compared to infrastructure built in data centers: How to get proper internet on the train? How can a network look like?...
Godot meets JetBrains: (godotfest2025)
JetBrains Rider is a great IDE for Godot. But how does it work? In this talk, we'll take a behind the scenes look at how we build the Godot features in Rider. We'll cover some of the challenges we've faced while creating a good user experience for Godot development in C#, GDScript and C++. We'll see how we've made it easy to debug your game, either in C# or GDScript, and tell the story of adding unit testing support through GDUnit. We'll see how we write inspections for your code, and provide code completion...
Newcommer Session (denog17)
Welcome to your first DENOG conference. In this session, we will guide you through the community, the event and everything DENOG!
Licensed to the public under http://creativecommons.org/licenses/by/4.0
about this event: https://pretalx.com/denog17/talk/KFLJDB/
Video:denog17-81766-eng-Newcommer_Session_hd.mp4
Security.txt across the industry (denog17)
This talk explores the adoption of `security.txt`, as defined in [RFC 9116](https://www.rfc-editor.org/rfc/rfc9116), that enables websites to publish security contact information in a consistent and accessible way. We begin with a brief introduction to the RFC and the motivation behind standardized vulnerability disclosure.
But is this even important to the network industry? To find out, we conclude with a focused analysis of security.txt adoption among organizations represented by this conference’s attendees, highlighting real-world trends, blind spots, and where we go from here.
Licensed to the public under http://creativecommons.org/licenses/by/4.0
about this event: https://pretalx.com/denog17/talk/WKBJGE/
Video:denog17-75240-eng-Securitytxt_across_the_industry_hd.mp4
"What can possibly go wrong?" Stories of peculiarities of modern server hardware (denog17)
After discussing building a 1 Tbps/1 Gpps load generator on commodity x86-64 hardware, one of the most common follow-up topics was the reasoning behind some of the decisions. And here I've realised that it is not commonly understood that modern systems are more complex than classic multi-socket NUMA systems, and that if you don't consider some of their peculiarities, you won't achieve the expected performance. In this talk, I want to explore what happens when you break those assumptions and how you can identify them. All examples would be based on the assumption that...
Understanding and optimising transceiver efficiency using internal metrics for improved power savings (denog17)
In high-performance optical communication systems transceiver health and efficiency are critical to network reliability and energy consumption. This presentation explores the powerful capabilities of Versatile Diagnostics Monitoring (VDM) features found in modern optical transceivers (beyond the speed of 100G) with a particular focus on the Thermoelectric Cooler (TEC) current metrics. By analysing TEC current alongside temperature and cable length data we should be able to identify the optimal operating conditions that will minimise power consumption while maintaining performance. In order to prove this thesis we developed a couple of software prototypes to perform the...
QoE Matters – How Application-Level Monitoring Pinpoints Network Issues (denog17)
Network operations engineers maintain the backbone of our digital experiences, ensuring robust connectivity and managing complex routing. Yet, even with great network health, where are the current limits of today’s routing technology? What does it mean when your manager calls you and says “Our customers can’t watch Netflix!”? Can we measure how the end users experience the high variety of OTT-services, beyond classical speedtests? In this talk, we will investigate real-world scenarios where network issues, even seemingly minor ones, impacted video QoE. We'll demonstrate how solutions to these problems often go miles beyond classic...
Th3 Flock of Bird s (denog17)
As Bird is evolving over the years and we now have Bird version 3 available at our fingertips, maybe we should know the capabilities of it and what performance we can expect from it.
Get some numbers in comparison with other routing stacks.
Let's take a quick look on the shiny new feathers Bird prepared for us.
Licensed to the public under http://creativecommons.org/licenses/by/4.0
about this event: https://pretalx.com/denog17/talk/XRVTP3/
Video:denog17-78857-eng-Th3_Flock_of_Bird_s_hd.mp4
Edge-of-Your-Seat Streaming: inside waipu’s terrabit-scale live-video CDN (denog17)
Live video stresses every layer of a CDN: traffic spikes hit terabit scale in seconds, latency budgets shrink to single-digit seconds, and a single congested peering link can stall millions of viewers. This talk walks through how we built a custom Golang edge stack that now serves 5.5 Tbps across five German PoPs. We’ll unpack the caching hierarchy, peer-aware user steering that exploits BGP and ECMP, and the trade-offs between channel affinity, cache size, and uplink utilization. We'll also touch on observability with Prometheus and client-app telemetry enriched by CMCD. Licensed to the public under...