samba on aix

Some features that are not provided in the AIX version of Samba are:

    Samba as LDAP server or client
    Samba as Active Directory server
    Kerberos server support
    DCE/DFS support
    DNS Updates support
    Automount / smbmount support
    PAM support
    NISPLUS support
    Cluster support


http://www.ibm.com/developerworks/aix/library/au-aix_samba/