I read this blog: https://blog.cloudflare.com/introducing-cname-flattening-rfc-compliant-cnames-at-a-domains-root/
and could not yet figure out exactly how it works with public DNS servers.
When the user sends A request to my APEX domain (ex.com), does the resolver send the request to the DNS provider Authoritative nameserver that sends ש CNAME to the CDN Authoritative nameserver that resolve the IP and sends it back to the user through the DNS provider Authoritative nameserver?
In this article: A Look at the ECS Behavior of DNS Resolvers, that can be found here: https://www.semanticscholar.org/paper/A-Look-at-the-ECS-Behavior-of-DNS-Resolvers-Al-Dalky- Rabinovich / 70cbdde39a204b074fae15157e5b4bb24456a2bb
They show this example:
- Is packet No. 3 is a CNAME?
- Why is there a redirection in Fact 8?
- Does your brother Resolver know how to contact the cloud flare CDN Authoriative nameserver in Fact 12?
I would be happy if someone knows the subject and can detail or give an example with what packets are sent between the servers.