localhost name lookup

[Lee]

On Sun, Jan 12, 2025 at 5:15 PM Eric wrote:
>
> That is means that the 'domain' is reserved and can be used locally. It doesn't specify all records in that namespace / domain will resolve to 127.0.01.
>
> Think of it like .com
>
> If you want every A record in *.localhost to resolve to 127.0.0.1 what you did will do that.

Did you look at the RFC?

   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...

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

So OK.. SHOULD isn't the same as MUST so bind as configured isn't
violating that RFC.  But is there a _good_ reason to not follow the
SHOULD recommendation?

Thanks,
Lee

>
> Jan 12, 2025 4:38:09 PM Lee:
>
> > Excuse my ignorance, but
> >
> > https://datatracker.ietf.org/doc/html/rfc6761#section-6.3
> >
> >    The domain "localhost." and any names falling within ".localhost."
> >    are special in the following ways:
> >
> > sure seems to mean that if I lookup curlmachine.localhost I should get
> > a 127.0.0.1 or ::1 address returned.  Correct?
> >
> > I had to change my db.local file to
> >
> > $ cat db.local
> > ;
> > ; BIND data file for local loopback interface
> > ;
> > $TTL    604800
> > @       IN      SOA     localhost. root.localhost. (
> >                               3         ; Serial
> >                          604800         ; Refresh
> >                           86400         ; Retry
> >                         2419200         ; Expire
> >                          604800 )       ; Negative Cache TTL
> > ;
> > @       IN      NS      localhost.
> > @       IN      A       127.0.0.1
> > @       IN      AAAA    ::1
> >
> > *       IN      A       127.0.0.1
> >         IN      AAAA    ::1
> >
> >
> > to make localhost and curl.localhost work.
> >
> > Is this wrong?  and if so, why?
> >
> > TIA,
> > Lee
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