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Eech0Shu

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The approach involves using electricity to alter the properties of the film, so that it changes from acting more like a “black body” – which absorbs and emits electromagnetic radiation but does not reflect it – to becoming more like a metal, which reflects radiation but is not good at absorbing or emitting it.

Could this be used for thermal management? E.g. reflect during the day, radiate during night?

Not at a location where I can check with my home ISP right now. But last time I checked a few days ago it affected some of the AAAA records that docs.rust-lang.org was pointing to. The affected ISP is deutsche telekom.

I sent an email to the contact listed in the whois database but didn't get any reply.

That only applies if you have a very myopic view on what the internet does. Sure, CDN traffic may dominate by volume but it is far from the only traffic on the internet. P2P traffic is still significant.

web ⊂ internet

There's some RFC suggesting that CGNATs handle PCP requests from the CPE thus allowing incoming connections. But sadly that's not implemented everywhere.

Sadly the "happy eyeballs" algorithm obscures IPv6 problems. For example some subnets of amazon cloudfront are v4-reachable from my ISP while being v6-unreachable. But others are v6-reachable. When a DNS name points to a mix of v4 and v6 addresses nobody notices the failure because browsers are quick to fall back to v4 and thus the issue never gets reported.

The other problem is that such issues are difficult to report in the first place as private customer because customer support is geared towards dealing with user errors or last mile problems.

For the 64bit suffix there are ipv6 privacy extensions. For the prefix some ISPs hand out a whole /56 to the user so their CPE can rotate through multiple /64s over time. And of course just like they can shuffle IPv4s they can also shuffle IPv6s.