Samba und PDC

Hallo

Wie kann ich Samba dazu bringen die Passwortabfrage ueber den PDC zu
erledigen.
Der PDC hat die ip 192.168.250.31 und sitzt in der Domaine lts.local.

Was muss ich an meiner smb.conf aendern damit es klappt.

christoph

[global]
  workgroup = lts
  security = domain
  encrypt passwords = Yes
  update encrypted = Yes
  map to guest = Bad User
  null passwords = Yes
  unix password sync = Yes
  socket options = SO_KEEPALIVE IPTOS_LOWDELAY TCP_NODELAY
  character set = ISO8859-15
  add user script = /usr/local/bin/add_user
  os level = 2
  ;preferred master = False
  local master = No
  ;domain master = False
  password server = 192.168.250.31
  wins server = 192.168.250.31
  kernel oplocks = No
  printing = lprng

[homes]
  comment = Home Directories
  read only = No
  create mask = 0640
  directory mask = 0750
  browseable = No

[all]
  path = /
  read only = No

[printers]
  comment = All Printers
  path = /var/tmp
  create mask = 0600
  printable = Yes
  browseable = No