Re: Cloudflare reverse DNS SERVFAIL, normal?

[David <opendak () shaw ca>]

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.