"This is the first line in the Samba 3.0 release notes:
"'Active Directory support. Samba 3.0 is now able to join an ADS
(Active Directory Service) realm as a member server and
authenticate users using LDAP/Kerberos.'
"The intent of this article is to show you how to configure your
Linux machine and Samba server to participate in a Windows 2003
Active Directory domain as a Member Server using Kerberos
authentication. This involves using the security = ADS security
mode in Samba..."