Techlog

I had AI write a script to analyze Caddy logfiles to see the ratio between IPv4 and IPv6 for this blog.

In a previous post I wrote that I started a gofundme to produce an IPv6 related tutorial series on YouTube, accompanied by blog posts, slides, labs and contributions to other projects like https://github.com/becarpenter/book6/ All videos will max. 20min,…

Based on another “IPv6 is bad” post on mastodon I diced it’s finally time: https://gofund.me/49dd0f9c9 Fund me to produce an IPv6 related tutorial series on YouTube, accompanied by blog posts, slides, labs and contributions to other projects, e.g. https:/…

It’s been a while but I just update the IPv6-Resources list on gitlab.

When you search the internet on how to use net-snmp with IPv6 most of the examples you’ll find look like this: snmpwalk -v2c -c lab udp6:[3fff:172:20:20::5] | head -1 iso.3.6.1.2.1.1.1.0 = STRING: "Arista Networks EOS version 4.35.0F-44178984.4350F (engi…

If you want (or in my case have too) test some stuff with SLES and network equipment, you just can add a SLES container to your ContainerLab lab: name: suse-lab topology: nodes: suse: image: registry.suse.com/suse/sle15:latest

What’s done wrong here?

I recently looked at a curriculum for a basic level course of a well known vendor.

If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.

A short one, also via mastodon: host deutschehochschule.de deutschehochschule.de has address 162.159.134.42 deutschehochschule.de has IPv6 address ::ffff:162.159.134.42 deutschehochschule.de mail is handled by 0 deutschehochschule-de.mail.protection.outlo…

This is another post that started after several toots on mastodon.

In another blog post I wrote that I’m using make to restart BIND and showed the following example: root@dns:/etc/bind# cat Makefile all: /usr/sbin/named-checkconf -z /usr/sbin/rndc reload The all in the above Makefile is the default target

Another troubleshooting tale.

Just so I find it again when I run across the same problem in the future: I wanted to log in to one of my servers and couldn’t access it, because I couldn’t resolve the name from one specific domain.

Some shameless advertising: If you need some help with IPv6, DNS, Linux, Automation and related stuff feel free to contact me.

Yet another Mastodon-inspired post.

Some time ago I was asked why IPv6 wasn’t working.

Last year I did a presentation about my 1st IPv6 project.

In my last post, which made it to Hacker News, I wrote: "HE can have some funny side effects.

One of my lasts posts made it to Hacker News.

Yesterday I read this toot (German) over on mastodon which starts with “IPv6 is hard.”

https://github.com/ipinfo/cli [https://blog.sdn.clinic/2025/03/wireguard-and-vrfs/9(https://blog.sdn.clinic/2025/03/wireguard-and-vrfs/] https://github.com/girishji/pythondoc.vim

CLAT in Linux Networkmanager DNS delegation jc - Convert command output to json Stratoshark - Analyse syscalls curl from start to end Security Bingo Linux Routing Fundamentals Packet where are you nftable-tracer

Some time ago I asked on Mastodon if someone would be interested in a series of videos about IPv6.

Last week I talked about ContainerLab at our admin meetup in Berlin.

The basic Idea: What if we put together an “advent of IPv6” just like – https://adventofcode.com/ or https://tryhackme.com/r/christmas Gitlab repo including my slides from RIPE89 https://gitlab.com/jenslink/advent-of-ipv6 There is also a mailing list: htt…

You want to make a presentation, write a blog post or document your brand-new software.

Welcome to my new blog.