I'm designing a DR solution in a geographically separate datacenter which will use Hyper-V 2012 R2 Replication to replicate several of our VMs to another Hyper-V cluster. The VMs will run a mix of Linux and Windows, with the Windows servers being Exchange, SharePoint, WSUS, etc.
I currently have a static IP assigned to all servers and VMs, i.e. I'm not using static DHCP reservations.
I have the ability to extend the private LAN subnet (let's call it 192.168.1.1) between the two datacenters over the public Internet using my firewall's VPN capability, but I'm wondering if there is a recommended best/better practice for this?
Is it okay to extend the subnet so in a fail-over scenario I can just power the VMs on in the DR datacenter without much manual intervention? Or would it be a better idea to configure my servers with a static DHCP reservation, so when they come up in the DR datacenter they can pull an IP on a unique subnet?