Internal DNS Best Practice - should a slave resolve internet domain names?

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I have inherited a internal DNS
solution at my new company and I want to start to improve its reliability! At the moment
there is one Master for the internal domain which forwards external DNS lookups to our
ISP. There is one slave which only seems to resolve internal
requests.

For improved resiliency should I be
setting the slave to forward internet lookups as
well?

Thanks for any
help.

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class="normal">Answer

Yes,
slave should be the same as master in all regards, except that it has a reference to
master to feed for any other changes. The purpose of a slave DNS is exactly to continue
doing what master was doing until it failed.

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