Chaos Computer Club - recent audio-only feed

Welcome to GodotFest 2025 - the first entry of the GodotFest event series! Join us as we kick off two exciting days of talks, workshops, and community connections. We’ll introduce the event, thank our sponsors, and set the stage for an amazing conference celebrating the Godot Engine and its vibrant community. Get ready to dive into technical insights, creative presentations, hands-on workshops, an...

**Is PPPoE really legacy? Is IPoE really better? And what actually happens when something breaks?** This talk takes a hands-on look at PPPoE and IPoE (DHCPv4/v6) in real ISP environments, based on actual deployments, not just specs. We’ll walk through the key operational differences that show up when things get serious: high availability, failover, MTU handling, multicast, and how dual-stack plays...

The Internet is not the same everywhere. And in Asia, the world’s most populous region with some of the fastest growing economies, it can be especially complex. Join Telstra to learn about how differently the Internet operates in Asia compared to Europe and North America, how those behaviour are likely to change as the impact of new AI workloads is felt across global networks, and what variables y...

Blackholing events often have prolonged impacts and typically require manual intervention for recovery. Even a single occurrence is highly disruptive, frequently triggering executive-level escalations. Resolving such incidents demands top-tier expertise and often involves engagement with the vendor’s advanced technical support. To accelerate root cause identification, we present several methods fo...

As a Junior Engineer, the consumability of a network automation tool can really make or break your experience. Some incredibly smart engineers and developers build amazing tools for specific use cases, but they can be tough to use unless you know all their quirks. This is especially frustrating when you're just starting out. That is why I want to share a small project I worked on including all the...

That's a wrap on Day1, time for the social! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.com/denog17/talk/MVDVUL/

Past approaches for maximizing the data capacity per fiber pair went for running more and more DWDM channels with grid spacings as small as possible. This meant that grid spacings shrank from 200GHz to 100Ghz and then 50GHz with some applications even going for 25Ghz. In recent years the bandwidth per channel kept increasing, as complex modulation schemes came into favor over ON-OFF-Keying which h...

At Hetzner we’ve historically used an Open vSwitch based data plane for connecting hundred thousands of cloud servers to the network. This has served us well for many years and mostly still does. We have however reached some limitations and wanted to improve scalability, resiliency and flexibility with a more specialized data plane that's tailored to our needs while being easy to operate and build...

At DE-CIX, we're redefining network orchestration from first principles. Confronted with the limitations of existing systems, we set out to design a modern orchestration stack—one capable of managing a truly global network, seamlessly interfacing with a variety of upstream and downstream systems, supporting fully managed network devices, and, above all, delivering uncompromising reliability. In th...

For years, InfiniBand has dominated high-performance interconnects. Yet for strategic and technical reasons, there has been a huge industry ask to develop a new next-generation protocol for use in AI and HPC environments. This session introduces Ultra Ethernet, an innovative standard designed to tackle the limitations seen in RDMA around scalability, latency and congestion management, crucial for...

As it's common practice, each new hacker event needs something weird and funky. For this years summer camp in the Netherlands called WHY2025, we build a 400G link over a single fibre. Since 400G BiDi does not exist (yet), we had to get creative and built something, which might be considered out of spec. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https...

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 even...

How we route-leaked everything to everyone due to a fun Arista bug. A post-mortem kind of story about us changing Arista RCF function names, resulting in a global route leak. The talk includes the history of why we intended to make a change, how we rollout configurations, why it resulted in an unexpected behavior and how it was fixed. Licensed to the public under http://creativecommons.org/license...

This talk presents how to to offload networking tasks onto dedicated hardware/smartNICs/NPUs (network processing units) - chips, and why this is a great idea. First, we take a look at chips in general - how they are made, integrated into networks, and why time is playing to the advantage of dedicated chips vs. CPUs/software. Then, focus is on how offloading network tasks is a particularly beautifu...

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 conclu...

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...

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...

Last year we migrated our datacentre networks from a flat layer 2-based architecture to EVPN-VXLAN. As an organisation whose primary technical background is in software, a network project of this complexity has been a journey into new and uncharted territory. Our previous network design had been showing signs of reaching its limits for several years, so in late 2023 we started designing a replacem...

Do you have probes installed to monitor your network border? Ever struggled to estimate the fallout-perimeter of a probe alerting quality-deterioration? We show an example how to firmly map probes to interconnect points and secondly, how to identify which other traffic is likely affected by the same problem. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event:...

This talk would be held by my two colleagues: Michael Bayr (artcodix) and Gerhard Bader (Yorizon Cloud) Yorizon Cloud is the joint venture of HOCHTIEF PPP Solutions and Thomas-Krenn. AG In these times of global political and technical threats and disruptions, we are driven by our spirit of digital sovereignty when we design a new European, de-centralized, sustainable and custom-made cloud infrastr...

Automation is at the heart of Inter.link's operations. Our team manages complex software that automates the entire customer journey, from correctly accepting orders for services such as IP Transit or DDoS and translating them into precise network configurations, to setting up billing and robust monitoring. This automation is critical, allowing us to rapidly develop and deploy new features while ma...

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-serv...

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 E...

EVPN is (now) a well know Service Framework and is widely used as a replacement for VPLS ELAN Services and even some IP-VPN Services. EVPN was able to also do P2P ELINE Style services for quite some time, but with the finalization of RFC9744 it got some very interesting capabilities that can especially help aggregation networks to reduce scaling problems. The talk will give a very brief primer on...

Welcome to DENOG17! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.com/denog17/talk/YPAXF8/