Network security groups (NSGs) are simple, stateful packet inspection devices. Detail: Use a network security group to protect against unsolicited traffic into Azure subnets. By default, there are no network access controls between the subnets that you create on an Azure virtual network. Routing between subnets happens automatically, and you don't need to manually configure routing tables. Detail: Use CIDR-based subnetting principles to create your subnets.īest practice: Create network access controls between subnets. These allow rules lead to a false sense of security and are frequently found and exploited by red teams.īest practice: Segment the larger address space into subnets. Detail: Ensure troubleshooting procedures discourage or ban setting up these types of rules. The private IP address spaces available are in the Class A (10.0.0.0/8), Class B (172.16.0.0/12), and Class C (192.168.0.0/16) ranges.īest practices for logically segmenting subnets include:īest practice: Don't assign allow rules with broad ranges (for example, allow 0.0.0.0 through 255.255.255.255). The idea behind an Azure virtual network is that you create a network, based on a single private IP address space, on which you can place all your Azure virtual machines. Logically segment subnetsĪzure virtual networks are similar to LANs on your on-premises network. A straightforward, unified security strategy reduces errors because it increases human understanding and the reliability of automation. If you use a common set of management tools to monitor your network and the security of your network, you get clear visibility into both. Governance of network security elements, such as network virtual appliance functions like ExpressRoute, virtual network and subnet provisioning, and IP addressing.Management of core network functions like ExpressRoute, virtual network and subnet provisioning, and IP addressing.Virtual machines connected to an Azure virtual network can connect to devices on the same virtual network, different virtual networks, the internet, or your own on-premises networks.Īs you plan your network and the security of your network, we recommend that you centralize: That is, you can connect virtual network interface cards to a virtual network to allow TCP/IP-based communications between network-enabled devices. You can connect Azure virtual machines (VMs) and appliances to other networked devices by placing them on Azure virtual networks. Opinions and technologies change over time and this article will be updated regularly to reflect those changes. These best practices are based on a consensus opinion, and Azure platform capabilities and feature sets, as they exist at the time this article was written. How you can learn to enable the best practice.Possible alternatives to the best practice.What might be the result if you fail to enable the best practice.Why you want to enable that best practice.These best practices are derived from our experience with Azure networking and the experiences of customers like yourself.įor each best practice, this article explains: This article discusses a collection of Azure best practices to enhance your network security.
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