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SarK
SarK
New Member
November 19, 2025
Question

Foritgate in Azure using multiple subnets and vnets

  • November 19, 2025
  • 2 replies
  • 525 views

I have an existing Azure environment with a vFG that currently has one subnet. However, we need to add several more VNets with different subnets now, and we want the FG to control the traffic between them.
Each LAN side NIC needs to be on a separate subnet, which would put it in a separate vNet.  All NICs have to be on the same VLAN.  I'm not sure how to configure this.  

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2 replies

Jean-Philippe_P
Staff & Editor
Jean-Philippe_P
Staff & Editor
November 22, 2025

Hello Sark, 

 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Jean-Philippe - Fortinet Community Team
zoyanma9
zoyanma9
New Member
November 22, 2025

You have to peer the VNETS with your Fortigate VNET, then setup user defined route table for each subnet within your VNET pointing to the Fortigate interface(s). Then of course your Fortigate will need routes back to your VNET interface gateway IP. You can route your subnets to one Fortigate interface or multiple different interfaces for firewall segmentation.

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