[Samba] joining mac os x client to samba old-style PDC

[Mariano Absatz]

Hi,

I have an old samba PDC (no active directory, plain smbpasswd file) 
running a standard ubuntu samba package (3.0.28a-1ubuntu4.10 from ubuntu 
8.04.4 LTS).

I have a bunch of windows xp clients which I had no problem joining to 
the domain.

Now I need to see the shares from a macbook pro running OS X 10.5, but 
when I go to
Applications -> Utilities -> Directory Utility
If I go to the services tab, I only see Active Directory and see no way 
to use traditional (non-AD) mode. I nonetheless try to join the domain, 
but it says:

"Invalid domain. An invalid domain and forest combination was specified. 
You shoud enter a fully qualified DNS name for the domain and forest"

I even tried to add our internal DNS domain (which have no AD or LDAP 
service) and put as a preferred server the FQDN of my samba server to no 
avail.

How can I join this domain? Is there something I can install on Mac OS X 
10.5 that allows me to join a non-AD samba 3 PDC?

TIA

-- 
Mariano Absatz - "El Baby"
el.baby at gmail.com
www.clueless.com.ar