How does a child domain point back to parent?

[mkrieger at readersdigest.com]

Let's say that my DNS is authoritative for mycompany.com (internal
corporate domain).  I create NS and A records to delegate the
us.mycompany.com to another name server.  No problem so far.

If the us.mycompany.com server receives queries from clients that want
to resolve hosts in mycompany.com, what needs to be done on the server
that's authoritative for us.mycompany.com?  I don't want it going to
the root name servers because they'll return the mycompany.com Internet
address (mycompany.com is both internal and external).

Thanks,
Matt


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