How does a child find its parent?

Kevin Darcy kcd at
Tue May 8 18:14:28 UTC 2012

On 5/8/2012 1:56 PM, Mike Bernhardt wrote:
> Reading the section on delegation in the O'Reilly book, I'm confused about
> something: The parent is configured to delegate the subdomain to the child
> with glue records, etc. But how does the child know who to ask if a host in
> the subdomain requests a record in the parent zone? They don't show any
> configuration example for that other than making the child a slave for the
> parent zone.
It would follow the same algorithm as it would for queries of names in a 
completely different namespace, e.g. it might follow the delegation 
chain down from the root zone.

Note, however, that it is generally considered good practice to separate 
recursive and non-recursive functions. If that practice is followed, an 
authoritative server for a zone won't be trying to answer queries about 
its parent zone, unless it also happens to be authoritative for that 
parent zone (in which case it has an authoritative copy of the zone and 
it's a moot point).

     - Kevin

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