I am looking for ideas on how to provide a Disaster Recovery solution for thousands of ATMs (Automated Teller Machine) deployed in the bank enterprise network. The solution should consider
the following facts:-
1.- Having the ATMs switch the connection to the Server at DRC shouldn't be automatic. This situation might last for the next few years until DRC becomes mirror image of primary data center.
2.- The ATM servers at the primary and disaster recovery center is single server equipped with high availability (Tandem). I mean to say, there is no SLBs invloved in the connection
3.- The application running on the ATMs is calling the ATM Server by hardcoded IP address in the application. The bank is willing to visit the ATMs to change once and forever.
I see source natting as the most appropriate solution, however your opanion and expertise are appreciated.