When a user without Azure credentials clicks a shareable link, a webpage opens that prompts the user to sign in to the target resource via RDP or SSH. The Bastion Shareable Link feature lets users connect to a target resource using Azure Bastion without accessing the Azure portal. If you configure a custom port value, specify that value when you connect to the VM.Ĭustom port values are supported for the Standard SKU only. By default, the inbound ports used to connect are 3389 for RDP and 22 for SSH. You can specify the port that you want to use to connect to your VMs. For more information about the AzureBastionSubnet, see the subnets section in this article. Using a smaller subnet limits the number of instances you can create. To allow for host scaling, the AzureBastionSubnet should be /26 or larger. Instances are created in the AzureBastionSubnet. Once the concurrent sessions are exceeded, another scale unit (instance) is required. For example, if you're doing something data intensive, it creates a larger load for the instance to process. The number of connections per instances depends on what actions you're taking when connected to the client VM. This is called host scaling.Įach instance can support 20 concurrent RDP connections and 40 concurrent SSH connections for medium workloads (see Azure subscription limits and quotas for more information). If you use the Standard SKU, you can specify the number of instances. When you configure Azure Bastion using the Basic SKU, two instances are created. You connect to client VMs via an Azure Bastion instance. An instance is also referred to as a scale unit. It's fully managed by Azure and runs all of the processes needed for Azure Bastion. You can choose to use a public IP address that you already created, as long as it meets the criteria required by Azure Bastion and isn't already in use.Īn instance is an optimized Azure VM that is created when you configure Azure Bastion.The Public IP address name is the resource name by which you want to refer to this public IP address.The Public IP address assignment/allocation method must be Static.The Public IP address SKU must be Standard.The Public IP must have the following configuration: You can configure this setting using the following methods: MethodĪzure Bastion requires a Public IP address. The subnet can't contain other resources.The subnet must be in the same VNet and resource group as the bastion host.For more information, see the Host scaling section of this article. Using a smaller subnet space limits the number of scale units. For host scaling, a /26 or larger subnet is recommended.Subnet size must be /26 or larger (/25, /24 etc.).Subnet name must be AzureBastionSubnet.The subnet must have the following configuration: You must create this subnet in the same virtual network that you want to deploy Azure Bastion to. All Azure Bastion resources deployed in subnets of size /27 prior to this date are unaffected by this change and will continue to work, but we highly recommend increasing the size of any existing AzureBastionSubnet to /26 in case you choose to take advantage of host scaling in the future.Īzure Bastion requires a dedicated subnet: AzureBastionSubnet. FeatureĬonnect to target VMs in peered virtual networksĪccess Linux VM Private Keys in Azure Key Vault (AKV)Īzure Bastion supports upgrading from a Basic to a Standard SKU.įor Azure Bastion resources deployed on or after November 2, 2021, the minimum AzureBastionSubnet size is /26 or larger (/25, /24, etc.). The following table shows the availability of features per corresponding SKU. The Standard SKU enables premium features.The Basic SKU provides base functionality, enabling Azure Bastion to manage RDP/SSH connectivity to virtual machines (VMs) without exposing public IP addresses on the target application VMs.You can upgrade a Basic SKU to a Standard SKU. The SKU is configured in the Azure portal during the workflow when you configure Bastion. Azure Bastion supports two SKU types: Basic and Standard. The sections in this article discuss the resources and settings for Azure Bastion.
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