When deploying an Azure Bastion host, the network configuration must meet specific requirements depending on the Bastion SKU. For a Bastion Basic SKU, the associated public IP address must fulfill all of the following Azure-defined conditions:
SKU requirement: The Bastion Basic host requires a Standard public IP address.
Tier restriction: The IP must be Regional, not Global, because Bastion operates within a specific Azure region and cannot use global IPs.
Assignment requirement: The IP must use Static allocation, as Bastion requires a reserved, unchanging public IP for consistent access and DNS resolution.
Supported IP version: Azure Bastion supports IPv4 addresses only; IPv6 addresses are not supported.
From the table provided:
IP1 - Standard, Regional, Static, IPv4 # # Meets all requirements.
IP2 - Standard, Global, Static # # Global tier is not supported.
IP3 - Basic, Dynamic # # Bastion requires Standard SKU and Static IP.
IP4 - Basic, Static # # SKU must be Standard.
IP5 - IPv6, Dynamic # # IPv6 and dynamic IPs are unsupported.
Therefore, only IP1 meets the Microsoft Azure Bastion Basic deployment prerequisites.
Reference (Azure Administrator Docs Extract):
Azure Bastion hosts require a Standard, Regional, Static, IPv4 public IP address. Basic or Global IPs are not supported for deployment.