4 Just so we don't forget the required features for an AD-compatible DNS server:
6 - Symmetric Bind-style TKEY handling (not strictly needed for AD, but needed for
7 integration to other name servers / tools)
8 (- Command line tools that unix admins are used to)
9 - Zone transfer support (XFER, IFER) (look at AD for permission settings)
11 - dynamic zone reloading