WAN Replicated Service Availability?

[Guy B. Purcell]

On Nov 15, 2004, at 16:37, Rick Reineman wrote:

> How to deploy a series of replicated services (web, ldap and oracle) 
> across a wide geographical area with the goal being survivability in 
> the event of a significant Internet outage?

F5 has a product, called 3-DNS, that runs on their BigIP load balancers 
that does what you're looking for.  A Cisco Distributed Director will, 
too, I believe (I'm not a network guy--yet!).  The F5 product is 
essentially a special nameserver that knows about the load balancers 
it's running on, so can direct traffic appropriately when one of the 
balanced networks goes offline.  It can also balance the load between 
the various networks, based on several criteria (i.e. it treats the 
fail-over as just a special case of the more general problem).

-Guy