BIND started replying to queries for .com with .COM

Phil Mayers p.mayers at
Fri Apr 1 11:12:39 UTC 2016

On 01/04/16 11:52, Niall O'Reilly wrote:

>> If you are going to pick a single authority for a particular label, it
>> should be the zone that determines whether that label exists or not.
>    That seems no less arbitrary a rule of thumb than one which would
>    give priority to the zone which contains the authoritative NS records.

In a normal recursive resolution of, it's worth noting 
that only the root servers actually return "com.", in the authority 
section of the referral. The .com servers return ""

What should happen if the following query sequence happens:

www.example.COM -> root => com.        NS
www.example.COM -> TLD  => example.COM NS ns.example.COM

Who is right here? The root with ".com" or the TLD with ".COM" as part 
of a longer label?

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