[Samba] xp logon issue

[Kilaru Sambaiah]

Hi,
  I have setup Samba 3.0 as PDC and all the desktops are able to login
and no issues. One laptop user is not
  able to logon out side the office (PDC is not available). Win 2003,
he doesn't have such problem. How to enable cache so that
  user can logon even if domain is not available?
  I tried google, but my framing may not be right, so I didn't get any
help. Thanks in Advance.

Thanks and Regards,
Sam