I installed FC10 on one of my HP Proliant Server.My active directory is in windows 2008.I gave the authentication to all the users of active directory to access all the books which are on FC10. I make it possible by Krb5, Samba, nsswitch.

What my manager wants is that as we have three campus - one in A1,other in A2 and A3 each in remote places.He wants that all the users in all the campus should be able to access the same and the authentication should be from AD. and in all the three campus we have different AD with diferent name.

Now the question is how to authenticate multiple AD.
All the three campus are connected with VPN.



Any Hint how gonna I set it up?