root servers

[Felipe Arrudi]

Hello.

Internally, we are defining a DNS structure with a new suffix (*.XYZ.).
We are a worldwide company with several sub-companies so each delagation
will have its own domain (COMPANY1.XYZ, COMPANY2.XYZ, etc.).

I have two questions:

1- Which is the best configuration for our root servers, including
definitions for XYZ. domain and BIND parameters (recurse, check-names,
etc) (BIND 8.2.1). How it works: One primart root server with several
slave servers, or several primary servers sharing the same config?.

2- What's the best way to configure all servers to allow internal
queries (*.XYZ.) and external queries (*.COM, *.EDU, etc.)? How can I
separate external and internal names?

Regards...

   F.A.