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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 % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 273k 0 273k 0 0 3417k 0 --:--:-- --:--:-- --:--:-- 3553k $ curl -6 https://github.
IPv4 was routed via the VPN tunnel and those IPv4 addresses were allowed in the web servers access list. But back to the original problem: In another toot we learn that a support ticket was opened four weeks ago and that traceroute was prohibited. Some notes: I’ll cover traceroute and co. in a future blog post and regarding GitHub check out this link.
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