this post was submitted on 19 Apr 2024
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Privacy
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You know you can setup a single instance of PDNS or other resolver and by default they all work in a non-distributed way. You assuming to much, and again while it is likely that most providers running custom stacks already have the functionally built in, it isn't a guarantee and once you've thousands of servers running the same piece of software across the globe deploying updates and features becomes way slower and way harder.
That is not what they do, though. Just because a non standard configuration is possible doesn't mean that's the best thing to use. DNS, by design, uses authoritative nameservers, which is what cloudflare and quad9 host. These authoritative hosts distribute their records to caches (usually just recursive DNS resolvers) to ease and distribute the load. It's literally in all of their documentation, and explained in pretty plain english on their pages.
https://www.cloudflare.com/learning/dns/what-is-dns/ https://www.quad9.net/about/
When a record is updated in your domain (or cloud) provider, it is distributed via an authoritative nameserver hosted by that company. These get distributed to the root name servers, which then distribute the records to other authoritative nameservers.
I don't know why you're arguing over this, when it's one of the first things you learn in information systems and networking. Sure, there's a lot of stuff for the infrastructure. But the way DNS works on these hosts is still the same, and blocking a single record is not difficult and does not take extra engineering effort. The authoratative hosts simply change their records and it's done. DNS takes care of the rest.
There's an entire wikipedia page on this: https://en.wikipedia.org/wiki/DNS_blocking
The thing is, everything you said is correct. But if you think they can just solve this globally for everyone and everything without delays by just pushing things their root servers or the first line of authoritative ones then what else can I say.
They can, because that's how DNS works. This is why when you update a record for your domain it's updated globally in near real time with multiple providers. I don't know how else to tell you that it already works this way. I work in the cloud, and deal with this stuff on a daily basis.
So, you know that "near real time" is different from actual real time.
You're clearly going keep nitpicking and changing the subject to things that don't matter and you're not willing to learn. Your misunderstanding of the fundamentals of DNS is no longer my issue.
Okay, so tell me something, in your "ideal world" replication-based only scenario, what happens if they're ordered to take down a specific A record that has a very large TTL, more than a govt would like?
Depending on the TTL, right ?
Correct!