pinging from the secondary DNS server, not from the primary DNS server
when ping name, os contacts preferred dns name resolving. ip address gets can either domain controller, old 1 , new one, because dns have service records both dcs , go through them round robin.
the dns role , domain services roles not linked. i.e. because 1 preferred dns not mean preferred dc.
why critical reply 2008 dc?
if because want demote 2003 dc, don't worry. when demoted, removed dns , dns query dc return 2008 dc because dc knows.
Windows Server > Directory Services
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