This includes intra-subnet traffic as well. All network traffic is allowed through a subnet and network interface if they don't have a network security group associated to them.įor outbound traffic, Azure processes the rules in a network security group associated to a network interface first, if there's one, and then the rules in a network security group associated to the subnet, if there's one. VM4: Traffic is allowed to VM4, because a network security group isn't associated to Subnet3, or the network interface in the virtual machine.VM3: Since there's no network security group associated to Subnet2, traffic is allowed into the subnet and processed by NSG2, because NSG2 is associated to the network interface attached to VM3.
Traffic is either allowed or denied to all resources in the same subnet when a network security group is associated to a subnet. Since VM2 doesn't have a network security group associated to its network interface, it receives all traffic allowed through NSG1 or is denied all traffic denied by NSG1. 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. If NSG1 has a security rule that allows port 80, the traffic is then processed by NSG2. Unless you've created a rule that allows port 80 inbound, the traffic is denied by the DenyAllInbound default security rule, and never evaluated by NSG2, since NSG2 is associated to the network interface. VM1: The security rules in NSG1 are processed, since it's associated to Subnet1 and VM1 is in Subnet1.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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