What NS-records to put for your server?

Question

Domain Name System

There is a domain, I want it to refer to my router (for example, its ip: 40.0.0.0). In the DNS settings, you need to specify at least 2 NS records, as I understand it, they point to the DNS servers for my domain (often they write NS records there, which are listed on the hosting site you use). There are also standard NS. I correctly understand that in order for my domain to refer to my ip, it is enough to leave the default NS + add an A record from "myhost.ru." "myip address"?

Answer 1

If I understand correctly, you want to assign an A-record to your router so that myhost.ru resolves to your router.
NS is a DNS server that services DNS requests. Through it, you change the DNS values.
If the domain already has standard NS defined and your registrar already gives you DNS management in their control panel, then you don't need to change the NS.
Right. It is enough to create an A-record in the existing panel.
NS servers are changed if they want to change the provider that manages DNS records and requests to them from users.
For example, if you are unhappy with the way DNS records are managed, or the timing of DNS record changes, or the performance of the DNS server (frequent attacks), and you want to manage your DNS in Amazon Route53, then you will need to change NS servers to those provided by Amazon Route53.