How to ensure redundancy and uninterrupted server availability?

Question

Domain Name System

Faced the problem of creating a fault-tolerant web server.
There are problems with the Internet connection, I turned on the second provider, but I have no idea how to properly configure the server for two addresses.
I looked in the direction of round robin dns, but, as far as I understand, some providers form their own ns-records and my resource will be unavailable for a certain proportion of hosts, since users will remember me under a different address.

Answer 1

1. Take AS and /24 network.
2. Set up a BGP session with 2 or more providers. The network is reserved.
3. Reserve the web server using VRRP. at least one server is dead - the rest function perfectly on the same IP address.
Where to do this is the tenth question and depends on the thickness of the wallet.

Answer 2

I advise you to transfer the server to a hosting company that has no problems with the Internet.
There are enough real problems (security, scalability, DDoS protection, speed, etc.) that it's not worth spending time building crutches for bad internet.

Answer 3

Go to the cloud, if you really need to host at home, then colocation will help