NVGRE Gateway Cluster Problem

Hello
We have following setup:
Management Hyper-V hosts running WAP, SPF and SCVMM 2012 R2 components
Gateway Hyper-V host: single node gateway hyper-v host, configured as a single node cluster to be able to join extra hardware in the future
this Hyper-V host runs 2 Windows Server Gateway VMs,configured as a failover cluster.
The following script is used to deploy these windows server gateway VMs as a high available NVGRE gateway service:
http://www.hyper-v.nu/archives/mscholman/2015/01/hyper-v-nvgre-gateway-toolkit/
two tenant Hyper-V hosts running VMs which are using network virtualization
The setup is completed successfully and when creating a tenant in WAP and creating VM network for this tenant using NAT, the VMs of this tenant are accessible and can access Internet using the HA Gateway cluster.
The Gateway Hyper-V host and NVGRE Gateway VMs are running in a DMZ zone, in a DMZ Active Directory Domain.
Management and Tenant Hyper-V hosts, incl all Management VMs, are running in a dedicated internal Active Directory domain.
Problems start when we failover the Windows Server Gateway service to the other VM node of the NVGRE Gateway cluster. We see in the lookup records on the Gateway Hyper-V host that the MAC address of the gateway record for tenants is updated with the new
MAC address of the VM node running the gateway service.
But in SCVMM, apparently, this record is not updated. The tenant hosts still use the old MAC address of the other Gateway VM node.
When looking in the SCVMM database, we can also see that in the VMNetworkGateway table that the record representing the gateway of the tenant, still points to the MAC address of the PA network adapter of the other node of the NVGRE Gateway cluster, not to the
new node on which the gateway service is running after initiating a failover.
On the tenant hyper-v hosts, the lookup record for the gateway also points to the old node as well.
When manually changing the record in the VMNetworkGateway table to the new MAC address, and refreshing the tenant hosts in SCVMM, all starts working again and the tenant VMs can access the gateway again.
Anybody else facing this issue? Or is running a NVGRE Gateway cluster on a single Hyper-V node not supported?
To be complete, the deployed VMs running the gateway service are not configured as HA VMs.
Regards
Stijn

If i understand your post correctly you have a single Hyper-V Host running 2 GW VM's. I think the problem is that when you deploy a HA VM Gateway Cluster it wants to create a Cluster Resource (PA IP Address) on the Hyper-V host as well. So when you run 2
hyper-v hosts and 2 gw vm's and you move the active role to another host it will move the Provider Address to the other Hyper-V host as well. I believe this is by design. You should ask yourself also the question why running 2 vm's in a cluster on the same
node ;-)
I would recommend to use 2 node Hyper-V Host Cluster (This is needed for the HA PA Address, And not necessary for your GW VM's )
Then run the deployment toolkit again. Now when that's done again, take a close look on how the Active node on the Hyper-V host has the corresponding PA assiogned on that Hyper-V host. Then do a failover, refresh the cluster manager and take notice
of the PA address that has moved along to the other Hyper-V host that is the active one. It is diffuclt to explain, in a couple of sentences but i hope you have the opportunity to build the 2nd Hyper-V host aswell and create a cluste.
Side note: if you want to keep the excising VM Gateway cluster. remove all gateways from VM Networks and remove the Gateway service from VMM. Then provision the second Hyper-V Host, Configure Cluster, Live migrate 1 GW VM node to it. Reconfigure
Shared VHDX for quorum and csv and then add back the network service again. Don't try to leave it as a network service in VMM and move the VM to another node. It will not work when failover.
Best regards, Mark Scholman. 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.

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Best regards, Mark Scholman. 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.

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