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Configure your local subnet following the Azure instructions
Create the virtual network to extend your local network in Azure
In Abiquo, create the Abiquo virtual datacenter with a subnet of the Azure virtual network. See Manage virtual datacenters#Createavirtualdatacenterwithcustomnetworksdatacenters in the section on Create a virtual datacenter with a custom network.
In Abiquo, add the Azure network details to your tenant as enterprise properties. See Configure Azure VPNs
Configure the site-to-site VPN connection following the Azure instructions. See Manage VPNs
You can also use Abiquo to deploy the VM that will be the second domain controller.
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