Hyper-V Replication - Subnet Configuration Between Datacenters?

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?

Hello Matt,
The answer is yes for Hyper-V 2012 R2, however this feature was available only for Windows Guest OS'es in Hyper-V 2012.
This works only on synthetic network adapters, not legacy network adapters, and it requires Windows XP SP2/Windows Server 2003 SP2 and newer OS'es to be running on the virtual machine to work. This
also works with Linux virtual machines that are running the latest Linux distributions.
As a good practice is to complete the failover TCP/IP configuration on the primary virtual machine with its normal IP configuration. In that way, if the replica is ever activated, replication is
reversed, and the virtual machine is then failed back to what was the primary, and the correct IP address for the primary location can automatically be put back.
Hope this help.
Regards,
Charbel Nemnom
MCSA, MCSE, MCS, MCITP
Blog: www.charbelnemnom.com
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial
to other community members reading the thread.
This is incredible. We are running Hyper-V 2012 R2 with the latest CentOS 6.5 and synthetic network adapters. Thank you so much.
Oh, hey! I read your blog! :)

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