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Chaos Computer Club - recent audio-only feed

Der Chaos Computer Club ist die größte europäische Hackervereinigung, und seit über 25 Jahren Vermittler im Spannungsfeld technischer und sozialer Entwicklungen.

technology

All Episodes

00:14:26

Opening Remarks (godotfest2025)

Chaos Computer Club - recent audio-only feed ·

2025/11/11

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, and networking opportunities with fellow Godot enthusiasts from around the world. Whether you’re a

00:30:34

The Asian internet - A guide for the uninitiated...

Chaos Computer Club - recent audio-only feed ·

2025/11/11

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 you need to think about when architecting your own network so that your company can make the most of the

00:32:53

PPPoE vs IPoE: A Practical Guide for ISPs (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/11

**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 out in practice. We’ll also dive into the hidden pain points, like why hardware offloading fails in

00:24:32

Uncovering Blackholes: Advanced Detection Techniques...

Chaos Computer Club - recent audio-only feed ·

2025/11/11

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 for detecting blackholing events, identifying the affected transit flows, and analyzing potential

00:25:26

Making Network Automation Consumable: A Junior...

Chaos Computer Club - recent audio-only feed ·

2025/11/11

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 applications I used and what I learned from it. Fancy tools are great, but at the end of the day,

00:05:40

Day 1 Closing (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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/

00:24:23

Channelmania! – future proof your DWDM network...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 has been a staple in fiber optic communication for decades. Those increased per channel bandwidths of

00:28:07

Forwarding packets at scale - Building a Cloud Data...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 building a strong foundation for new features. When checking our options back in 2022, the team reached the

00:26:52

Ultra Ethernet: Addressing AI/HPC Interconnect...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 democratizing future AI/HPC build outs. Join us for a comprehensive exploration of the technologies

00:29:53

Inventing the wheel - Network Orchestration at scale...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 this talk, we share our transformation journey—from our starting point to our vision for the future

00:11:45

400G ZR+ BiDi does not exist, it can't hurt you. Or...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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://pretalx.com/denog17/talk/KLXJS8/

00:07:59

Th3 Flock of Bird s (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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/

00:11:31

Sorry we messed up (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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/licenses/by/4.0 about this event: https://pretalx.com/denog17/talk/KQ9JWA/

00:09:59

Security.txt across the industry (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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

00:25:56

200 GbE network processing with 100 W - or "can I...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 beautiful example of the advantages of hardware-implementing logic, with examples like TCP offloading,

00:27:08

Understanding and optimising transceiver efficiency...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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

00:24:50

"What can possibly go wrong?" Stories of...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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

00:21:56

EVPN for the rest of us – what happens when software...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 replacement based on EVPN-VXLAN, terminated directly on our Linux hypervisors. After not quite nine months of

00:25:07

Performance measurement goes Flow (denog17)

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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: https://pretalx.com/denog17/talk/YGMU8X/

00:32:46

Evolving Inter.link's Software Delivery: Lessons in...

Chaos Computer Club - recent audio-only feed ·

2025/11/10

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 maintaining operational excellence. Achieving this level of automation required investment in our

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