Azure Gateway

[almahmoud]

We are now using a mock cloudbridge wrapper for Azure gateways, as they are not needed to connect an instance to a public IP (following this answer: https://social.msdn.microsoft.com/Forums/en-US/814ccee0-9fbb-4c04-8135-49d0aaea5f38/equivalent-of-aws-internet-gateways-in-azure?forum=WAVirtualMachinesVirtualNetwork). However, a "Virtual Network Gateway" does exist to create custom routes. https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview We could talk about mapping cloudbridge gateways to that Azure object for more functionality.

[afgane]

xref #170