VM’s and services in Azure infrastructure by default are not connected to any virtual network and operate in an isolated mode. This makes the VMs in Azure not accessible to other VMs by default .If you want the VMs in Azure to access each other, then you have to create a virtual network and join the VM’s to the network. This way you can achieve a network overlay that allows the VMs to communicate to each other but still remain inaccessible to the outside network. The topic which I’m covering here is to create a Cloud-Only virtual network, that allows
the VMs and services in the Azure Infrastructure to become accessible to each other.
Cloud-Only virtual network configurations are VNets that don’t use a virtual network gateway to connect back to your on-premises network or directly to other Azure VNets. They aren’t really a different type of VNet, but rather, they are a way to configure a VNet without configuring cross-premises connectivity. You connect to the VMs and cloud services from the endpoints, rather than through a VPN connection.
Cloud-Only configurations are very easy to create. This is because you don’t need to coordinate your IP address ranges with the...(Read whole news on source site)