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https://azure.microsoft.com/en-us/documentation/articles/virtual-networks-nsg In one of my recent engagement with my partners, I had the opportunity to test NSG power, facing some limitations and gaining some good knowledge and experiences I would like to share with you.For some of them, I will include links to existing documentations since published before this blog post.You can see details of to retrieve NSG associated to a subnet, in ARM there is not, you essentially need to retrieve the subnet object and then navigate through the properties and see which NSG, if any, is linked.- NSG logs: Logs and diagnostics for NSG are only available in ARM, there is no ASM coverage, see section “” later in this blog for details.Customers can control access by permitting or denying communication between the workloads within a virtual network, from systems on customer’s networks via cross-premises connectivity, or direct Internet communication.In the diagram below, both VNETs and NSGs reside in a specific layer in the Azure overall security stack, where NSGs, UDR, and network virtual appliances can be used to create security boundaries to protect the application deployments in the protected network.In this case the tool you have chosen has taken care of ensure that, since your VM is exposed to the Internet, access is restricted and secured.
For incoming traffic, NSG set at the subnet level is evaluated first, then the NSG set at the NIC level. The picture below should even clarify this concept more: you can see how rules are evaluated for network packets, once again remember that you need to evaluate this diagram two times: once for subnet level NSG rules, and once for NIC level NSG rules.
In ASM you can achieve the same using the Power Shell command below with the “-Detailed” switch: rules will ensure that no inbound traffic will be permitted, except for “polling” from Azure load balancer, connectivity inside the VNET/subnet is not blocked, outbound traffic will be permitted including also Internet address space. Suppose that you installed an IIS VM, you opened port 80 on the Guest OS firewall, you created a load-balanced or NAT rule for port 80.
Everything works fine, but now you decide to further secure your environment adding a new Network Security Group: you need to explicitly add a rule for port 80 and protocol HTTP, otherwise when you will apply to the VM/NIC or subnet, your existing application/service will break.
If you played already with NSG in ASM, then jumped to ARM, you will be a bit “disoriented”, especially if you used Power Shell, since there are some changes that you need to be aware of.
https://azure.microsoft.com/en-us/documentation/articles/virtual-networks-create-nsg-arm-ps Essentially, there is no perfect symmetry between ASM and ARM, at least in Power Shell.