free linux domain controller - who has experiences?

Hi.

I have no experience with DC running on linux. Google pointed out
Samba 4. But I couldn’t find something covering the possibility to
realize Domain Trust Relationships.

Has anybody done a domain trust relationships with Samba 4? The main
Domain is “2003-R2 domain level”.

Regards, Rudi.

Win2003-R2
MAIN DOM <–trust relation ship–> Samba 4 branch office DOM