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Active Directory is the Windows directory service introduced with Windows 2000 Server. A directory service catalogs network resources and data, such as user accounts, computer accounts, OUs, shared printers, folders, and just about anything else that might be available on the network. Active Directory manages the entire network environment, and all domain controllers maintain a copy of the Active Directory database. So, where is Active Directory located Active Directory maintains its catalog on each domain controller, and each domain controller replicates with partner domain controllers to keep the database synchronized, to provide fault tolerance, and to provide low latency. In the past, Windows NT networks used a Primary Domain Controller (PDC) and multiple Backup Domain Controllers (BDCs) to manage the network, but all domain controllers in Active Directory domains function as peers. Instead of one PDC, each domain controller can be used to manage the network, and Active Directory data is replicated to other domain controllers. Domain administrators manage Active Directory through three Microsoft Management Console (MMC) snap-in tools, namely Active Directory Sites And Services, Active Directory Trusts, and Active Directory Users And Computers. All user accounts, computer accounts, and even OUs are created and managed from within Active Directory. Figure 11-1 on the next page shows you the Active Directory Users And Computers tool found on a Windows 2000 domain controller.

Interix Software Development Kit. Using the tools, libraries, and documentation provided in the Interix Software Development Kit (SDK), you can port your UNIX applications to run on Windows computers through the Interix subsystem. Some of the SDK tools are covered by the GPL; you can choose not to install these tools. User Name Mapping. This component provides centralized mapping between Windows user accounts and UNIX accounts for Client for NFS, Server for NFS, Gateway for NFS, and Interix. With User Name Mapping, Windows and UNIX users can access files on each other s computers transparently and without compromising security. User Name Mapping can use UNIX accounts from Personal Computer Network File System (PCNFS) style files, or Network Information System (NIS) servers. Client for NFS. With Client for NFS, Windows-based computers can map an exported NFS share to a drive letter. This lets users access files on the file system as though they were on a local disk drive. They can also access NFS shares using Universal Naming Convention (UNC) names. Users can receive UNIX authentication credentials through User Name Mapping or from a PCNFS server (either UNIX-based PCNFS daemon [PCNFSD] or Server for PCNFS running on a Microsoft Windows NT based, Microsoft Windows 2000 based, or Microsoft Windows Server 2003 based computer).

Appendix I:

Server for NFS. The administrator of a Windows computer can use Server for NFS to share directories as NFS exported file systems, which makes it possible for UNIX-based clients to mount a shared directory just as they would an exported file system located on a UNIX server. User-level security is maintained because, in conjunction with Server for NFS Authentication, User Name Mapping maps the UNIX client s user identifier (UID) and group identifier (GID) to existing Windows user accounts. This ensures that UNIX clients are given appropriate access to files on Windows-based servers. Support for the Windows Server 2003 Volume Shadow Copy Service is also included, as well as simplified and enhanced authentication in Windows Server 2003 Active Directory environments. Gateway for NFS. With Gateway for NFS, Windows users can access exported file systems on NFS without running special client software on their computers. The Windows server running Gateway for NFS mounts exported file systems on UNIX-based NFS servers and then shares those mounted file systems as Windows networking shared drives. Gateway for NFS relies on User Name Mapping to provide the appropriate UID and GID for the Windows user, which allows transparent access to UNIX-based files without requiring users to log on to Windows and UNIX systems separately.

11

Gateway for NFS runs only on Windows Server servers. It does not run on Windows XP Professional based computers.

Server for PCNFS. This component is similar to a PCNFS daemon (PCNFSD) running on a UNIX server. Windows users running PCNFS or Windows Services for UNIX Client for NFS version 1.0 software on their computers can access NFS file systems by providing the required UNIX user name and password when they attempt to access an NFS file. Server for NIS. This component completely integrates UNIX Network Information Sys-

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