How to change the ldap-server for a Exchange Frontend-server (Exchange 2003)

I have a Exchange 2003-installation with an internal Exchange backend-server and a frontend-server in DMZ. The frontend authenticates the users by using ldap against the internal domain-controller. Now I have to replace the domain-controller with a new domain-controller (new name and ip) What config do I have to do on the frontend to tell it to authenticate against the new server?
thoreeAsked:
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