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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 QA. But I can come up with several methods to enter a birthrate in a mobile app.

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Visit techlog.jenslink.net → RSS feedOn Hacker News Feb 2025 – Jun 2025

Networking & Internet 2Systems & Performance 1Security & Privacy 1

1

IPv6 Is Hard

Yesterday I read this toot (German) over on mastodon which starts with “IPv6 is hard.” No it’s not. It’s different. I ran across this multiple times: There is an A and an AAAA-record for a FQDN, but the web server is only reachable via IPv4. You can easily test this with curl $ curl -4 https://github.com -o /dev/null…

2

How much EU is in DNS4EU?

This is another post that started after several toots on mastodon. Most of the things presented here were already tooted by other people, but I think this is a good chance to write a mini tutorial about what to look at. We’ll use DNS, whois, BGP and your favourite search engine. What is DNS4EU? To quote the web page…