Apache authentications

["Paul Burnet" <p.burnet@cranfield.ac.uk>]

I am trying to set up a cross campus authentication system for a webserver.
We have two campusses with two seperate domains that cannot talk to each
other for security reasons.  My first thought was to have two ldap servers
in each domain and pull the information to the seperate servers vi iplanet
nt syncronization and then use the referral system to connect the two.

So Basically i would like it so that when i try to log on with a username if
it doesn't exist on the first server it would go a look at the other one.

However they are bound to have a different base dn and as i understand it
the referral only occurs if the dn your searching for is not correct then
you get referred to the other server. Is this correct?

So i thought that on the apache side they might be some configuration that
would allow authentication with one server and if this fails then try the
other.  I have tried authldap but there only seems to be a provision for a
backup server which runs on the same dn.

Can anyone help with a way forward on this.