I have Linux with 1000 users in /etc/password & another Linux server with 200 users in LDAP. Recently, I have configured an Active Directory on Windows 2000. I would like to have following: Whenever users log into the domain, it should find out whether these users exist in the domain controller and if not, should search both of these Linux servers and authenticate them. Can someone suggest how to do and which version of samba should be used. . Thanks in advance Sougat Ghosh