[dns-operations] NXDOMAIN plus CNAME answer - works sometimes!?

[Roy Arends]

> On 22 Mar 2018, at 15:48, James Stevens <James.Stevens at jrcs.co.uk> wrote:
> 
> But "amazonaws.com" /does/ exist, so surely authority from the COM zone /alone/ can't be cited to say the CNAME doesn't exist?

Indeed. 

ns7.markmonitor.com is configured to be authoritative for _a_ com zone, not _the_ com zone. This server is misconfigured to do stupid DNS tricks.

Roy



> 
> 
> On 22/03/18 14:28, Roy Arends wrote:
>> The ns7.markmonitor.com server has been configured to respond authoritatively for the com zone and for the cgma.org zone.
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