You want to create a one-way or two-way nontransitive trust from an AD domain to a Windows NT domain.
188.8.131.52 Using a graphical user interface
184.108.40.206 Using a command-line interface
> netdom trust <NT4DomainName> /Domain:<ADDomainName> /ADD[RETURN] [/UserD:<ADDomainName>\ADUser> /PasswordD:*][RETURN] [/UserO:<NT4DomainName>\NT4User> /PasswordO:*][RETURN] [/TWOWAY]
For example, to create a trust from the NT4 domain RALLENCORP_NT4 to the AD domain RALLENCORP, use the following command:
> netdom trust RALLENCORP_NT4 /Domain:RALLENCORP /ADD[RETURN] /UserD:RALLENCORP\administrator /PasswordD:*[RETURN] /UserO:RALLENCORP_NT4\administrator /PasswordO:*
You can make the trust bidirectional, i.e., two-way, by adding a /TwoWay switch to the example.
It is common when migrating from a Windows NT environment to Active Directory to set up trusts to down-level master account domains or resource domains. This allows AD users to access resources in the NT domains without providing alternate credentials. Windows NT does not support transitive trusts and, therefore, your only option is to create a nontransitive trust. That means you'll need to set up individual trusts between the NT domain and every Active Directory domain that contains users that need to access the NT resources.
2.15.4 See Also
MS KB 306733 (HOW TO: Create a Trust Between a Windows 2000 Domain and a Windows NT 4.0 Domain), MS KB 308195 (HOW TO: Establish Trusts with a Windows NT-Based Domain in Windows 2000), MS KB 309682 (HOW TO: Set up a One-Way Non-Transitive Trust in Windows 2000), MS KB 325874 (HOW TO: Establish Trusts with a Windows NT-Based Domain in Windows Server 2003), and MS KB 816301 (HOW TO: Create an External Trust in Windows Server 2003)