On 18/06/2021 05:16, Daniel Miller via Pdns-users wrote:
Given a published zone of ".myzone.com" - I want to have a list of
hosts like:
a.sub.myzone.com
b.sub.myzone.com
c.sub.myzone.com
Nothing special. I can implement this by explicitly declaring each
host in my parent zone - and this works. But I want to manage the
subdomain separately. So besides creating a zone ".sub.myzone.com" and
adding the host records - what other "glue" is required?
Do I need to explicitly publish ".sub.myzone.com" with my registrar?
No.
Do I place NS records for ".sub.myzone.com" in the parent zone?
Yes. This is the delegation. The nameservers for sub.myzone.com aren't
necessarily the same as those for myzone.com.
Do I place NS records for ".sub.myzone.com" in the sub-zone?
Yes. This is the authoritative source of the NS records. (I always
thought this was a weird aspect of DNS design, as having two sources of
info makes it likely that they will be inconsistent, but that's how it
is. Just make sure they match.)
Do I need to explicitly declare a forward-zone for ".sub.myzone.com"
in addition to the parent zone?
No.
In any case, there's no such thing as a forward-zone in an authoritative
DNS server; that would be something in a recursor. But the recursor can
just follow the NS records. You shouldn't even have a forward-zone
entry for myzone.com.
The only exception would be if this is if myzone.com is a private
domain, which is not delegated in the public DNS. In that case, you
will need a forwarding entry for sub.myzone.com - but only if you're
forwarding to a different set of servers than myzone.com.
HTH,
Brian.
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