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On Feb 10, 2008 8:17 PM, Ken Sims <mdrg7319@xxxxxxxxxxx> wrote:
One issue, our disaster recovery system is in a completely different
location from our main system (as it should be), several hundred miles
away, and so it's on a different subnet (192.168.251.0/24 versus
192.168.10.0/24). So it would involve more than just having the
disaster recovery system use the main system's IP address. The
packets would never get routed to that subnet.

There are many ways to do this. The simplest solution is to use DNS
with a low TTL, but of course that has several drawbacks.

Using a seperate subnet for the cluster is the solution usually
implemented, and routing changed dynamically. If that is not possible,
policy routing, NAT are other ways to achieve the same result.

It would be possible to have the disaster recovery center be on the
same subnet as the main data center, but it wouldn't be easy.

I wouldn't use that approach either.


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