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List:       nanog
Subject:    Re: Cloudflare reverse DNS SERVFAIL, normal?
From:       Niels Bakker <niels=nanog () bakker ! net>
Date:       2016-08-31 14:18:27
Message-ID: 20160831141827.GG3955 () excession ! tpb ! net
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* owen@delong.com (Owen DeLong) [Wed 31 Aug 2016, 01:47 CEST]:
>You don't get NXDOMAIN when a nameserver gets a request for a zone 
>it doesn't serve.

Correct in most cases (there's an edge case where a server is [mis] 
configured as authoritative with its own empty . and its regular 
zones and allows global querying; it's similar to asking a root 
server for anything in a nonexistent TLD).


>You either get SERVFAIL or you  get NS records back as a referral.

Or REFUSED.


	-- Niels.
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