The "Series" you choose in Azure dictates the underlying hardware and network bandwidth.

Note: If you increase the vCPU count beyond your license (e.g., moving from a VM02 to a VM04), you must update the license file. 5. Summary and Best Practices

According to the latest FortiGate VM on Microsoft Azure Data Sheet, is mandatory for peak performance. Scenario A: Small Branch Office (Low Intensity)

To maximize the performance of your sized FortiGate VM, implement these architectural guardrails: High Availability (HA) Design

Decrypting traffic is resource-intensive. If your traffic is encrypted (HTTPS), you

If you want, I can also provide a comparison of versus Bring-Your-Own-License (BYOL) costs for your specific throughput needs.

Choosing the correct FortiGate Virtual Machine (VM) size in Microsoft Azure ensures your network security architecture balances high performance with cost efficiency. Selecting an incorrect size can lead to severe throughput bottlenecks or unnecessary cloud expenditures.

Small branch office, basic routing, or management-only VNet. Standard_F4sv2 / Standard_D4ds_v4

The number of interfaces you can attach is strictly limited by the VM size. A single FortiGate instance often requires at least four NICs (Management, External, Internal, and HA Sync).

Includes Antivirus and Sandbox. This is the most resource-intensive and can drop performance significantly.

When mapping Fortinet’s VM core licensing (VM-02, VM-04, VM-08, etc.) to Azure instances, use the following architectural baselines for production environments: FortiGate License Recommended Azure VM Size Target Use Case Standard_F2sv2 / Standard_D2ds_v4

The most flexible option. You are charged based on the Azure instance size, and the license scales automatically as you resize the VM. Bring Your Own License (BYOL):

Sizing a FortiGate VM is not just about matching the total throughput of your internet circuit. Cloud firewalls process diverse traffic types—east-west (vnet-to-vnet), north-south (internet ingress/egress), and hybrid (ExpressRoute/VPN). You must evaluate three primary vectors: Compute vs. Security Inspection Levels

High traffic volumes with many simultaneous connections require more RAM. 2. FortiGate VM Licensing & Azure Instance Matching