I don't think there is a recommendation one way or the other, but there are
things that should be done differently to stop registrations of addresses on
the external NIC.
272294 - Active Directory Communication Fails on Multihomed Domain
Controllers http://support.microsoft.com/default.aspx?scid=kb;en-us;272294&FR=1
There isn't a recommendation either way. There shouldn't be a problem with putting DNS on the ISA server though and can simplify some things. I would
recommend against putting a ISA on a DC though. This can be problematic.
Thank you,
Mike Johnston
Microsoft Network Support
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