CNAME RRs

[Will Yardley]

Terrence Koeman wrote:
> Isn't
> 
> subdomain.domain.tld.  IN  CNAME  host.domain.tld.
> host.subdomain.domain.tld.  IN  A  0.0.0.0
> 
> the same thing as:
> 
> [zone - domain.tld.]
> subdomain  IN  CNAME  host.domain.tld.
> subdomain  IN  NS  <same nameserver as domain.tld.>
> 
> [zone - subdomain.domain.tld.]
> host  IN  A  0.0.0.0

not really.  a CNAME is exclusive of other records since it's a direct
alias to another zone.  so you shouldn't use one if you need to also
have an NS record (or NS records) for the same subdomain.

i am pretty sure this is exactly what they're trying to say you can't do
actually.

the solution is simple; don't use a CNAME if you want to delegate child
zones!

-w

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