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Comment by jurajmlich | Hacker News Reader

It seems it has caused DNS servers crash for one of biggest Czechia's internet provider - Vodafone. Can be unrelated but I doubt it (https://twitter.com/BlazejKrajnak/status/1445063232486531099).

Think of it - half the country doesn't have internet because of this crash, that's terrifying. (Switching DNS servers obviously works but that's not something the general population will do)

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If only the news reporting was not as stupid as "internet is not working at UPC", instead of DNS resolvers at UPC crashed, here's what you can do...

Anyway, I didn't even notice since I run knot-resolver at home.

I wonder what it will be like connecting Facebook back to the internet, thundering herd and everything...

I suspect that the DNS aspect will be fine. The middle DNS servers only need one valid response to cache it for $TTL, but they can't cache SERVFAIL.

I mean connecting your company to the internet when you have billions of devices waiting in the line to fetch updates, or whatever.

Will not that be an issue? Re-enabling routing to such a massive internet service...

I suspect it will slowly get there. We'll find out, it is recovering now.

> but they can't cache SERVFAIL.

Correction: according to Cloudflare's blog post, some do cache errors as well.

Quite likely. Cloudflare has a report that outlines the reason behind it: https://blog.cloudflare.com/october-2021-facebook-outage/

Same in the UK, I've just experienced external DNS outage on BT!

All most people have to do now is install an app and it takes care. But messaging need to go from media and news.

Vodafone is down in Romania too.

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