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Message: [QUOTE="dojo, post: 4461226"] Current Environment I Have 2 NT 4.0 Domains, "DomainA" & "Domain_C" "DomainA" Most of the User and Computer accounts are in "DomainA", "DomainA" has one PDC and one BDC. Some other servers. "Domain_C" Some accounts and most of the Resources are in "Domain_C" "Domain_C" has one PDC and one BDC Mail server (OS: windows 2000 server) Outlook Web Access (OS: windows 2000 server) Primary and Secondary DNS, WINS, DHCP services(OS: windows 2000 server) Print Server (OS: windows 2000 server) SQL 2000 (OS: windows 2000 server) Almost 99% of the clients in both Domains are on OS Windows 2000 professional. DNS servers have all static entries which are like server1.ExternalDomainName.com, server2.externalDomainName.com Server3.ExternalDomainName.com which is being used by both the domains. Server part in the above FQDN is local servers used by local users and remote VPN clients. ExternalDomainName.com is name owned by the company and has a valid web presence. New AD domain names (suggested) would be "DomainA" example corp So full FQDN will be corp.externalDomainName.com "Domain_C" will be child domain of Corp (suggested) "Domain_C" example "DomC" So full FQDN will be DomC.corp.externalDomainName.com Question. At the time of AD upgrade my Domain controller will look for DNS servers which are Authoritative for Domain "corp" and "DomC", If I create DNS zones on DNS servers which will provide support for resource records and Dynamic updates.All the systems in these domains will try to create dynamic records, which will ultimately create duplication with my existing records. How will the DNS server's with static entries for the same server names will handle these resolutions. Since the static entries are saying server1.ExternalDomainName.com 10.10.10.1 and the Dynamic entry will be server1.corp.ExternalDomainName.com 10.10.10.1 and how will it affect resolution on the client side. (also consider the fact that I am keeping the WINS services for a while after the upgrade) [/QUOTE]

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