GRE tunneling option was enabled with Update Rollup 5 in SCVMM 2012 R2. But to fully enable it you had to install some update on NVGRE Gateways. I’ve predicted that such hotfix will be available soon and now it is out. You can find it here and enable the full scenario with VMM and NVGRE Gateways. Here are some of the scenarios that you can use this feature for. Documentation is for vNext but now this feature is enabled in Windows Server 2012 R2 and System Center 2012 R2.
To enable it. Download and install the hotfix on your NVGRE Gateways. Restart will be required. Make sure your SCVMM 2012 R2 server is Update Rollup 5. Refresh your gateways in VMM console -> Fabric Pane-> Networking -> Network Service -> right click Gateway and refresh. Open the properties of a gateway. Go to Provider tab. Click Test. After that for VM Network you will be able to add GRE tunnel when you have Gateway attached to that network.
Stanislav Zhelyazkov has been working in IT since 2007. Stanislav has started his IT career as a Help Desk Specialist in 2007 while studying Informatics in the University of Ruse. He also worked in HP Enterprise Services (now known as DXC), maintaining large corporate IT infrastructures for clients in Holland, Switzerland and Germany and was involved in a Private Cloud project based on MS Hyper-V and System Center. He was also in the role of Principal Consultant in Lumagate developing and consulting companies on Azure, OMS, management and Private clouds. Currently he is Cloud Infrastructure Engineer at Sentia Denmark. Stanislav is active community member at MSDN forums providing answers on Azure. His blogposts can be found at www.cloudadministrator.net or www.systemcentercentral.com.
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