I need as a response of a request an interaction of two LDAP-Server.
From the other LDAP-Server the authentification and if successfull from
our LDAP-Server the attributes.
Is there a fair chance to get a solution using the ldap/meta backend.
Just a hint without thoroughly thinking about it. Maybe you could use
slapo-rwm for rewriting only the bind requests to another name space
served by back-ldap. Or maybe have a look at slapo-translucent and
combine it with back-ldap.