Okay “I lied too many people” is a little harsh. I didn’t know better and repeated what I had read else where. And I repeated it in many talks, workshops or consulting gigs. And I know several other people who repeted the same thing. Here is what I told people

The use of DHCPv6 is steared via router advertisments.

Router advertisments( (RA) are defined in RFC4861. There are two flags regarding DHCPv6.

I didn’t want to rant in this blog, but as this a technical issue, I’ll do it anyway. I’m not a software developer, I don’t know anything about UI design and I also don’t do software QS. But I can come up with several methods to enter a birthrate in a mobile app.

• A date field where you can enter dd/mm/yyyy or mm/dd/yyyy (depending on where in the world you are).
• Some dropdown field where you can scroll down and find the correct values

What I would never have come up with would be a calendar. Starting on the current date. You’ll have to swipe to your birthday. On a monthly basis. So more than 600 swipes for me.

A couple of days ago I watched a video on YouTube where, during a demo, the creator tried to download a file via wget. It didn’t work. When he tried curl, it worked (That was only a very tiny part of the video).

So why does curl work and wget not? My guess: broken IPv6 on the host. Happy-Eyeballs (HE) is defined in RFC8305 and is used to workaround broken IPv6 connections. It only works for HTTP(S). Basically if a target is dual-stacked a client supporting HE makes two connections to the target and then uses the better (as in working or faster) connection. So if IPv6 on your host is broken you won’t notice.

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

IPv4: 58.51%
IPv6: 41.49%

Over the weekend I’ll work on some fail2ban rules to keep bots and (wordpress) junk out. Let’s see if this changes.

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, add free and I will reject any non relevant sponsoring.

Here are my ideas for the first 10 lessons (subject to change), not all off them strictly about IPv6, but also related topics like building your own lab, DNS, etc.