Blocking Access to Hidden Primary?

[Barry Finkel]

I have a hidden primary - dns0.anl.gov .  I know that our slave DNS
servers need access to the dns0 machine.  Is there a harm in blocking
all access from the outside world to dns0 (except from our slaves)?
Some of my colleagues want to limit access, and I am not sure what
problems it might cause.  Thanks.
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Barry S. Finkel
Electronics and Computing Technologies Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-9689
Building 221, Room B236              Internet: BSFinkel at anl.gov
Argonne, IL   60439-4844             IBMMAIL:  I1004994