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External Interface Down on Router - Network Node running on hyper-v 2012

Hi All,

I have been following the Juno install guide and have setup everything, however I am now getting networking issues when trying to use the gre plugin within Neutron.

All my management VMs are running on a Hyper-V 2012 server, and I have seperated the a Network node and my cloud controller. I can easily create new Networks, Routers, interfaces etc, but whenever I choose 'Set Gateway' to connect my network to the External Interface, I see 'Status: DOWN'.

Reading the istructions, it tells me to set Promiscous mode on the virtual switch, which I have done using cloudbases powershell module at:

However, I am still unable to get this connection online, and route my instances onto the external network. Please can someone point me in the right direction?