[Samba] Samba4 as a classic DC

[Mario Codeniera]

Hi,

I just curious if it is possible to make Samba4 as a classic domain
controller behaving as a Samba3 DC? I successfully migrated all the data
from Samba3, but because trust relationship is not yet supported I want to
retain as DC hoping it is still supported, isn't it?

Another query is it possible to link the internal LDAP of Samba4 to the
nscd? as a replacement to OpenLDAP for example.

Thanks and regards,
Mario