How to stop ANY zone transfer

[Chiesa Stefano]

Hello all.
I'm developing a web application to apply massive dns changes
automatically.
I have a master dns server and three slaves. To test the application I'm
going to create an identical copy of the master server (in the same
network too).
What is scaring me is the update of the slaves. If I don't change
anything in the Bind configuration on the test server at the first zone
change it will replicate the zone to the slaves, and I, obviously, don't
want it.

What is the best way to stop ANY zone transfer (even to the slaves
configured in the zones)?
Is a global "NOTFY NO" enough?

Thanks in advance for any suggestion.
Stefano.

----------------------------------------
Stefano Chiesa
Wolters Kluwer Italia
Strada 1, Palazzo F6
20090 Milanofiori Assago (Mi) - Italia
Phone +39 0282476279 (20279 Voip)
Fax +39 0282476815