[Samba] samba PDC and BDC with ldap master and slave backend

Hi all !
In the samba-Howto, i was looking on informations on how to set up
both a samba PDC and a samba BDC controller with ldap backend.
I can read:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Do not install a Samba PDC on a OpenLDAP slave server...
Possible PDC/BDC plus LDAP configurations include:
.. PDC -> LDAP master server, BDC -> LDAP slave server.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

And now i am wondering this questions :
.. if the samba DBC contain the following configuration
=> passdb backend = ldapsam:"ldap://slave.quenya.org ldap://master.quenya.org"
will samba store informations in the master ldap server or will it fail ?
Or is it necessary to put the master ldap server first like this :
=> passdb backend = ldapsam:"ldap://master.quenya.org ldap://slave.quenya.org"
.. can i install a samba BDC with a ldap slave server ? Yes you will answer me
but in the case where the master ldap server is unreachable, where does
the samba BDC will store new informations (Machine Trust Account password
for example wich are periodically changed)

Thanks for any precision
--
Jérôme

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Hi @ll,
i changed my vpn as recommended to ethertap ( tap0 )
now the trusts work as in the how to described.
So i didd a view tests with usrmgr but the simple try to admin my vpn domain
failed with domain was not found.
( After all the trust is established )

robowarp:/ # net rpc trustdom list
MUSI S-1-5-21-3861108627-588665743-2869584934

Trusting domains list:

MUSI S-1-5-21-3861108627-588665743-2869584934

this is vice versa
files:/ # net rpc trustdom list
ROBOWARP S-1-5-21-4039322326-1194518759-4008328055

Trusting domains list:

ROBOWARP S-1-5-21-4039322326-1194518759-4008328055

the same occurs if i try to add some user from the advynced properties
button of user permissons,
there is no way to browse the users the vpn domain
someone knows some tricks?
Best Regards

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