DNS question

[Hetz Ben Hamo]

Hi,

After big frustration from some DNS providers, I've decided to roll my own
with servers here in Israel, Ireland, and 2 US servers.
I've configured the Master in Israel and the rest are slaves.

I threw some domains, and the sync works great.

My problem is simple: The server in Israel answer queries from the world,
but should the slaves answer too?
If not, what happens when the master goes down?

I checked some big names servers (like Yahoo) - their servers don't answer
any queries.

So should the slave server be configured not to answer any query from
outside?

(I know it's a non issue in corporates where you can configure both master
and slave answer from internal IP's, but here there are no internal IP's).

Thanks,
Hetz
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