Other Notes on Aging and Scavenging
Static records (i.e., those added with the DNS console) are considered “permanent.” They have a creation/refresh timestamp of zero and are ignored during a scavenging pass.
The DNS server needs to retain each record’s creation/refresh timestamp across server restarts, which means writing this information to disk. For Active Directory-integrated zones, this information goes in—surprise!—Active Directory. For standard zones, the server has to store the information in the zone datafile. Thus, for standard zones with aging and scavenging enabled, the zone datafile format includes an extra field that is compatible only with name servers running on Windows 2000 or Windows Server 2003. An outbound zone transfer of a zone with aging and scavenging enabled is not affected, so you can still have other name servers as secondaries. But if aging and scavenging is enabled for a zone, you can’t take the actual zone file from a Windows Server 2003 name server and load it on, say, a BIND name server.
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