Hm, sorry, I'm starting to be a bit confused about what should be pulled
from the first domain -- what exactly do you mean by 'password information'. The set of data that is normally returned by 'getent passwd $user' ?

Sorry, I shall outline the details below.

autofs domain
- automount information
- group information

auth domain
- used for authentication only

For a bit more context we are in a university environment where central IT hold users passwords. Our department then has it's own ldap server for storing linux home directory mount information and the groups. In an ideal scenario our ldap server would be checked first and if authentication fails the central IT ldap server should be queried.

Does this make a bit more sense?