We have a dedicated 1Gbps L2 low latency connection between HQ and our DR site in addition to our 1Gbps Internet connections at each site. I plan to mirror HQ in DR with another SAN flash array synchronously replicating and another 3 node hyper-v cluster. The part I am not so sure about is networking. We have about 20 virtual machines and growing, many with static IP's and I need the failover to be as seamless as possible. I imagine it would be best to have the DR site on the same subnet as HQ, just like another office in the same building, but what about the firewall at the DR site and all our VPN tunnels from other sites? It gets a little confusing. Would I just establish those tunnels from both HQ and DR to all our other sites in advance so if HQ goes down they can reach our servers via the DR VPN tunnel? Any guidance on a best practice would be greatly appreciated.
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