On 2016-08-29 5:47 PM, Chris Adams wrote:
Once upon a time, Mark Andrews <marka@isc.org> said:
The following is general and is not directed at Cloudflare. I know some people don't think errors in the reverse DNS are not critical but if you are delegated a zone it is your responsablity to ensure your servers are correctly serving that zone regardless of where it is in the DNS heirarchy. Failure to do that causes additional work for recursive servers. If you don't want to serve a zone then remove the delegation.
You are assuming that an authoritative server operator has some way to know all the zones people delegate to their servers, and remove such delegations if they don't want to handle them. That is a wrong assumption.
Even more generally is that your authoritative server should respond to anything it is asked with an appropriate answer. Dropping/filtering can lead to bad situations.