![]() VM2: The rules in NSG1 are processed because VM2 is also in Subnet1. To allow port 80 to the virtual machine, both NSG1 and NSG2 must have a rule that allows port 80 from the internet. ![]() However if NSG1 allows port 80 in its security rule, then NSG2 processes the traffic. This blocked traffic then doesn't get evaluated by NSG2 because it's associated with the network interface. Unless you've created a rule that allows port 80 inbound, the DenyAllInbound default security rule denies the traffic. VM1: The security rules in NSG1 are processed, since it's associated to Subnet1 and VM1 is in Subnet1. This process includes intra-subnet traffic as well. Reference the previous picture, along with the following text, to understand how Azure processes inbound and outbound rules for network security groups: Inbound trafficįor inbound traffic, Azure processes the rules in a network security group associated to a subnet first, if there's one, and then the rules in a network security group associated to the network interface, if there's one. The following picture illustrates different scenarios for how network security groups might be deployed to allow network traffic to and from the internet over TCP port 80: The same network security group can be associated to as many subnets and network interfaces as you choose. You can associate zero, or one, network security group to each virtual network subnet and network interface in a virtual machine. For a complete list, see Services that can be deployed into a virtual network. You can deploy resources from several Azure services into an Azure virtual network. For each rule, you can specify source and destination, port, and protocol. A network security group contains security rules that allow or deny inbound network traffic to, or outbound network traffic from, several types of Azure resources. You can use an Azure network security group to filter network traffic to and from Azure resources in an Azure virtual network.
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