Fortigate Vm Sizing Azure __exclusive__ Link
Match your Fortinet core count license perfectly to the Azure instance vCPU count.
Without optimization, all network interrupts might hit a single CPU core (vCPU 0), causing that core to max out at 100% while others sit idle. Ensure that is enabled in FortiOS. This distributes the network processing load evenly across all available vCPUs, which is critical for 8-core configurations and larger. Summary Checklist for Azure FortiGate Sizing
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Azure offers dozens of VM sizes, but FortiGate performance depends heavily on the specific CPU architecture and network performance caps of the underlying hardware. Fortinet supports and optimizes specific Azure VM sizes. Compute-Optimized: F-Series (Fsv2)
To ensure the firewall didn't become a bottleneck, Alex made sure to enable Accelerated Networking Match your Fortinet core count license perfectly to
Alex started by looking at the standard issue Azure instance families. The Reliable D-Series : For most standard workloads, Alex looked at the Standard_D2s_v5
Not all Azure VM sizes are equal. FortiGate is CPU-intensive (especially for VPN and SSL inspection). Memory is less critical (minimum 4-8 GB required per Fortinet, but Azure often provides more). This distributes the network processing load evenly across
High-performance instances (e.g., Standard_F2 , Standard_F4 ) are often preferred for firewall workloads because they offer a high CPU-to-NIC ratio and strong compute power for packet inspection.
Azure enforces a strict maximum number of NICs per VM size. A standard high-availability (HA) firewall architecture typically requires at least four interfaces: Management Untrusted (Public/External) Trusted (Private/Internal) HA Sync (Heartbeat)
One of the most overlooked aspects of FortiGate-VM sizing on Azure is the each VM size supports. Azure strictly limits the number of NICs per VM based on its instance type.
