Networking WAN Links

Office A has a main SQL Server.  Office B has a backup SQL Server they are linked by a WAN link.  The SQL Servers use a technology that will allow them to automatically fall over incase of failure.  Remote offices have links to Office A via VPN.  Would the remote offices need to have VPN links direct to office B so they can access the backup server in case the main server at Office A went down or could they connect to Office A and the traffic be routed through to Office B via the WAN link between A and B.  Whats Best ?  
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Netman66Connect With a Mentor Commented:
They should route automatically provided there is a route present to B from A and each remote site to site B.

DNS would have to be correct in all locations in order for the client to be able to find the failover server.

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