What LDAP server do you use?  You can set up more than one LDAP servers 
that are associated with each other through replication.  One serves as 
the master LDAP server and others are slaves.  Directory information is 
propagate from the master to the slaves on a regular basis which is 
configurable.  In addition, using round-robin to help with load 
balancing and failover.  In case one LDAP server is down, other LDAP 
servers are still up with identical information.

Just a thought.

Bing

djinn_fr wrote:

> Hi,
> 
> I would like to setup LDAP to manage centralized password for a network 
> of 40 Linux (RHE 3.0) and Unix computers. My main problem is the fail 
> over in case of a network outage. For security reason, we have multiple 
> sub networks, so in case the network where the LDAP server is not 
> available anymore or if the LDAP server is down, what happens to people 
> that are trying to login.
> 
> How to setup LDAP to manage this problem ?
> 
> Thanks
> 
> Jean