Dell PowerConnect W Clearpass 100 Software 3.7 Deployment Guide - Page 94

.  NetBIOS Domain - automatically detected when joining the domain.  LDAP Server and Port Number - the hostname or IP address of the domain controller, with the corresponding port number of the LDAP service.  Bind Identity and Bind Password - credentials used to bind to the directory.  Base DN - the LDAP distinguished name of the root of the search tree. This is typically the Users container within the directory, but may be set to the root of the directory (for example, DC=example,DC=com) in order to authenticate both user and machine accounts.  Advanced Options - additional options controlling authentication against the directory. The following advanced options may be required in several common situations and are documented below:  access_attr_used_for_allow = yes: Determines if the access_attr LDAP attribute is used to allow access or to deny access to a user.  access_attr = msNPAllowDialin: The LDAP attribute name to be used for authorization checks. The default value for this attribute corresponds to the Active Directory "Remote Access Permission" setting. 94 | RADIUS Services Amigopod 3.7 | Deployment Guide