[0]: https://serverfault.com/questions/479367/how-long-a-dns-time...

I thought so too, but at least some do cache according to Cloudflare's blog post:

> Consequently, 1.1.1.1, 8.8.8.8, and other major public DNS resolvers started issuing (and caching) SERVFAIL responses.

https://blog.cloudflare.com/october-2021-facebook-outage/

https://nlnetlabs.nl/documentation/unbound/unbound.conf/#inf...

I am also thinking that all the poorly coded sites that don’t work unless the Share on Facebook button loads are also going to hemorrhage money. So are all the e-commerce sites that rely on Login with FB.

I hope this results in everyone rethinking adding all that shit to their infrastructure before the next time.

Why on earth would any system need a TTL beyond 1 hour? The longer the TTL the longer your outage period will be if a cache is poisoned.

So, two days is the TTL you get for your NS records. Of course, it takes way more than two days for people to stop querying your old records. I gave up after 30-45 days.

Anyway, the since the NS records for a domain come from the next level up, i.e. in this case the .com nameserver which are also the root nameservers, if they had a short TTL then those root nameservers would get hit pretty hard. Also, it isn't your choice what the TTL on your NS records is, it's admins of your top-level domains.

Load. Lower TTLs mean shorter term caches and more traffic.

This is a big deal, especially for root servers -- which is why the TTL is not customizable.

  > The problem isn't (wasn't) facebook.com's A records, it's that the
  > authoritative nameservers for facebook.com are (were) unreachable.

https://dns.google.com/cache

OpenDNS: https://cachecheck.opendns.com/

https://en.wikipedia.org/wiki/Mobile_cell_sites

I had a friend who worked deploying them many years ago to events for one of the cellphone providers in NZ.

https://matrix.org/blog/2019/03/12/breaking-the-100-bps-barr...

(I think this was posted already, and it's from 2019, but some people must have missed it - I only saw it this year)

Well, you know what can happen / If you're not careful with fire. / And for the light on a cigarette / A rug feels rather too expensive. / And from the rug the fire, alas, / Might have spread to the whole house / And who knows what would have happened thereafter?

There would have been a fire in the district / And the fire fighters would have had to come. / They would have honked in the streets / And unloaded their pipes. / And they would have sprayed fire / And it would have been in vain / And the whole city would have burned with nothing to protect it.

And the people would have jumped around / Fearing for their possessions. / They would have thought somebody had started a fire. / They would have grabbed assault rifles. / Everyone would have shouted: "Whose fault is it?" / The whole country would have rioted. / And they would have shot at the ministers behind the lecterns.

The UN would have become involved / And the UN enemies as well. / To preserve peace in Switzerland / Both would have come with tanks. / It would have spread, little by little, / To Europe, to Africa. / There would have been a World War and humans would be no more.

I lit a match / And it made a fire. / And for my cigarette / I wanted to take the fire from the match. / But the match slipped from my hand and landed on the rug. / Thankfully, I picked it back up.