As part of the user authentication process, it is necessary to search the LDAP server for one or more attributes associated with a particular user. Any search request must specify the base DN for the actual search. This field specifies the base DN which should be used to search the User directory. This is a NULL terminated 255 byte string. An example might look like cn=users,dn=foobar,dn=com. If this field is left blank, the Root DN will be used as the search base instead. As mentioned, user searches are part of the authentication process. They are carried out to retrieve information about the user such as login permissions, callback number, and group memberships. For Version 2.0 LDAP clients, it is strongly encouraged that this parameter be configured, otherwise a search using the root DN may not succeed (as seen on Active Directory servers). NOTE: This MIB object is for MM only. NOTE: This Mib object is deprecated and no longer supported.