this post was submitted on 16 Apr 2025
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Lemmy is so technical. I now have to look up what DNS is.
When you access something on the internet, you are accessing something on someone else's computer.
Computers have (effectively) postal addresses. When you want to access content on another computer, you type in its address.
But computer addresses don't look like "fedia.io" they look like "123.122.1.111".
When you type "fedia.io" your computer needs to go and ask what the computer's address is.
That's DNS. The Domain Name System. The system for finding the computer address from a domain name.
The above is very simplified and doesn't cover all scenarios, but I hope it's enough to get the idea.
Thanks for the explanation! How does this "break"? Seems like once it's set up, you don't have to fiddle with it again so I was wondering how it can suddenly stop working.
Addresses change all the time. Especially big websites will have many addresses for the same name and depending who (or from where) someone is asking for the name, they will tell them a different address. That way someone from Europe will connect to a server in europe and someone in the US to an american server. And cloud providers will have hundreds of addresses that they reuse and rotate for many customers.
Also to reduce the number of name request, the DNS system will cache answeres (save the answer and use it again later). If I ask for the address of Lemmy.org, they then change their address and I ask my DNS server again, I will get the old outdated address again.
There is also the question of who is actually in charge of answering DNS requests to a specific name.
All in all there are a lot of moving parts and for some reason people seem to be bad at managing their DNS records so when something breaks, very often it is because of DNS. (But also because DNS is very fundament so any problem with DNS will have a big effect so it is more noticeable)