localhost name lookup

[Nick Tait]

On 15/01/2025 10:47, Emmanuel Fusté wrote:
>> If so, does the ISC ship a db.local with a wildcard - eg.
>>    --- cut here ---
>> @       IN      NS      localhost.
>> @       IN      A       127.0.0.1
>> @       IN      AAAA    ::1
>>
>> *       IN      A       127.0.0.1
>>          IN      AAAA    ::1
>>    --- cut here ---
>>
>> to answer for any .localhost name?
> Don't please. See RFC6761 

 From RFC 6761:

    6.3.  Domain Name Reservation Considerations for "localhost."

        The domain "localhost." *and any names falling within ".localhost."*
        are special in the following ways:
    ...
        4.  Caching DNS servers SHOULD recognize localhost names as special
            and SHOULD NOT attempt to look up NS records for them, or
            otherwise query authoritative DNS servers in an attempt to
            resolve localhost names.  Instead, caching DNS servers SHOULD,
            for all such address queries, generate an immediate positive
            response giving the IP loopback address, and for all other query
            types, generate an immediate negative response.  This is to
    avoid
            unnecessary load on the root name servers and other name
    servers.

        5.  Authoritative DNS servers SHOULD recognize localhost names as
            special and handle them as described above for caching DNS
            servers.

To me this seems like a pretty clear endorsement for inclusion of the 
wildcard entry "*.localhost." in db.local?

Nick.
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