VMware Identity Manager uses your enterprise directory infrastructure for user authentication and management. You can integrate VMware Identity Manager with an Active Directory environment that consists of a single Active Directory domain, multiple domains in a single Active Directory forest, or multiple domains across multiple Active Directory forests. You can also integrate VMware Identity Manager with an LDAP directory. To sync users and groups, the VMware Identity Manager virtual appliance must connect to the directory.
Your directory must be accessible in the same LAN network as the VMware Identity Manager virtual appliance.
See Integrating with Your Enterprise Directory for more information.