Different LDAP base DN for different realms

[Giovanni Lovato]

I have an LDAP directory organized as follows:

dc=example,dc=org
|-ou=first
| \-ou=people
|   \-uid=john
|
|-ou=second
| \-ou=people
|  \-uid=john
|
\-ou=third
  \-ou=people
   \-uid=john

I would like to tell FR to do look in the appropriate OU based on the
relam the user authenticates, for example:

john at first will try to bind on uid=john,ou=people,ou=first,dc=example,dc=org
john at second on uid=john,ou=people,ou=second,dc=example,dc=org
ans so on...

How can I achieve this with virtual servers or unlang?

Thank you very much!
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