You can manage Teradata Vantage users in a supported directory, without installing Teradata schema extensions, using only native directory schema and tools. This method is required for uncertified LDAP-compliant directories. See About Certified Directories.
Restricting database access by user IP address (see Restricting Logons by IP Address) is not available when using only native schema to provision directory users. If you want to use IP address restriction, you must install and use Teradata schema extensions in the directory. See Provisioning Directory Users with Teradata Schema Extensions.