I recently switched over to OPNsense from my Ubiquiti Unifi Dream Machine. This is how I presented all my VLANs as interfaces.

To add VLANs as interfaces to OPNsense running on Hyper-V, you can follow these steps:

1. Configure VLANs on Hyper-V Virtual Switch:
   • Open Hyper-V Manager.
   • Navigate to the virtual switch settings.
   • Create VLANs corresponding to the VLANs you want to use on OPNsense.
   • Assign VLAN IDs to each virtual switch.
2. Configure Virtual Machine Network Settings:
   • Select the OPNsense virtual machine in Hyper-V Manager.
   • Go to its settings.
   • Add network adapters corresponding to the VLANs you created in the previous step.
   • Assign each adapter to the respective virtual switch with the appropriate VLAN ID.
3. Configure OPNsense Interfaces:
   • Log in to OPNsense web interface.
   • Navigate to Interfaces > Assignments.
   • You should see the additional network adapters corresponding to the VLANs.
   • Assign each adapter to an interface (e.g., LAN, WAN, OPT1, OPT2, etc.).
   • Configure IP addresses and other settings for each interface as needed.
4. Configure Firewall Rules and NAT:
   • Once the interfaces are assigned, configure firewall rules to allow or block traffic as per your network requirements.
   • If you’re using NAT, configure NAT rules accordingly.
5. Verify Configuration:
   • Test connectivity from devices connected to each VLAN to ensure that traffic is passing through OPNsense correctly.
   • Check firewall logs and monitor traffic to ensure that rules are being applied correctly.

By following these steps, you can add VLANs as interfaces to OPNsense running on Hyper-V and effectively manage your network traffic within your virtual environment. Remember to review and adjust configurations as necessary based on your specific network setup and requirements.