{"id":11257,"date":"2026-05-18T12:56:39","date_gmt":"2026-05-18T17:56:39","guid":{"rendered":"https:\/\/stevepedwards.today\/DebianAdmin\/?p=11257"},"modified":"2026-05-24T07:31:24","modified_gmt":"2026-05-24T12:31:24","slug":"azure-bastion-subnet-notes","status":"publish","type":"post","link":"https:\/\/stevepedwards.today\/DebianAdmin\/azure-bastion-subnet-notes\/","title":{"rendered":"Azure Bastion Subnet Notes"},"content":{"rendered":"
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Azure Bastion: Subnet Configuration Notes<\/p>\n

1. The \"Purpose-Driven\" Automation<\/h1>\n

Azure\u2019s UI uses a 'Purpose' selector to automate strict networking rules. Selecting 'Azure Bastion' from the Purpose dropdown transitions the setup from manual to managed configuration.<\/p>\n

2. Automatic Subnet Sizing<\/h1>\n

When the 'Azure Bastion' purpose is selected, Azure automatically suggests a compliant subnet range based on your VNet address space.<\/p>\n

Important Note: <\/strong>If your Virtual Network uses a \/24 address space (e.g., 10.0.0.0\/24), choosing the Bastion purpose will automatically default the subnet range to a \/26 (e.g., 10.0.0.0\/26). This ensures the subnet satisfies the minimum requirement of 64 total addresses required for the Bastion platform to scale and manage its instances.<\/p>\n

3. Strict Requirements Checklist<\/h1>\n\n\n\n\n\n\n\n
Configuration Item<\/td>\nStrict Requirement<\/td>\n<\/tr>\n
Subnet Name<\/td>\nLocked to AzureBastionSubnet<\/td>\n<\/tr>\n
Minimum Mask<\/td>\n\/26 (Provides 64 IPs, 59 usable)<\/td>\n<\/tr>\n
Subnet Purpose<\/td>\nAzure Bastion (Dropdown selection)<\/td>\n<\/tr>\n
Default Behavior<\/td>\nAutomatically carves \/26 from a \/24 VNet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. Professional Workflow<\/h1>\n