DeLegacy: Forcing IPv6 at Scale (gpn24)

DeLegacy: Forcing IPv6 at Scale (gpn24)

Author: CCC media team June 5, 2026 Duration: 56:23
Find out how to increase the proportion of IPv6 traffic by manipulating DNS responses, and how to persuade X/Twitter and Discord to support IPv6 _(caveats apply)_. Content Delivery Networks (CDNs) generate significant traffic, and almost all of them support IPv6. However, many websites that use CDNs lack IPv6 support. But when accessed over the right IPv6 address, these websites work without issue. With targeted DNS manipulations, the number of domains with IPv6 can be increased significantly. I have developed the [DeLegacy RPZ](https://codeberg.org/IPv6-Monostack/delegacy-rpz) project to achieve this. This talk explains the underlying mechanisms and how they can be utilized for this purpose. It shows how standard DNS servers, such as BIND or Unbound, can be configured to perform this task instead of using custom code. I reveal how to use DNS [Response Policy Zones](https://wikipedia.org/wiki/Response_policy_zone), [DNAMEs](https://de.wikipedia.org/wiki/DNAME_Resource_Record), and [DNS64](https://datatracker.ietf.org/doc/rfc6147/) to implement the intended manipulations. I also present my approach to identifying and testing useful domains and IP addresses when creating new rules. Finally, I present statistics on the increased IPv6 penetration, based on the [Tranco list](https://tranco-list.eu/). Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://cfp.gulas.ch/gpn24/talk/HRXC7H/

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Author: Episodes: 100

Chaos Computer Club - recent events feed
Podcast Episodes
Infrastructure Review & Closing (gpn24) [not-audio_url] [/not-audio_url]

Duration: 1:16:35
Große Zahlen und ganz viel WOW Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://cfp.gulas.ch/gpn24/talk/MTP7YB/
WAF: Wrong Approach Firewall (gpn24) [not-audio_url] [/not-audio_url]

Duration: 1:01:42
Web Application Firewalls (WAFs) for filtering based on HTTP and payload are omnipresent. In this talk an argument will be made that, in many cases, the wrong approach for implementing WAFs is chosen: They are implemente…
Building video games with 20 year old tech (gpn24) [not-audio_url] [/not-audio_url]

Duration: 19:10
The market is full of high-performance graphics APIs like Vulkan and fantastic engines like Unreal and Unity. So, why not use DirectX 9 and a self-built engine instead? ;) In this talk we'll take a quick stroll down memo…
Three Languages, Triple the Confusion (gpn24) [not-audio_url] [/not-audio_url]

Duration: 20:21
This code runs without errors, but still confuses. In this talk, we explore some subtle quirks of C, Python, and Java (and others) that catch even experienced developers off guard. No bugs, no typos - just the language d…
MMO-CHIP: From Microscope to Verilog in an hour (gpn24) [not-audio_url] [/not-audio_url]

Duration: 58:45
Reverse engineering old custom chips from microscope pictures is cool, but oh so painfully slow! Last time I did this (talk at 38C3), I spent two weeks waking up, annotating wires in Inkscape, going to bed, and then drea…
DI.Days as Anarchist Practice/Anarchist Practices for DI.Days (gpn24) [not-audio_url] [/not-audio_url]

Duration: 44:54
Digital Independence Days are a response to the growing monopolization of technology and the recent loss of trust in US-based tech firms after the USA's shift towards authoritarianism. The (communicated) goal is to prote…