How to create a Network Virtual Appliance in an Azure Virtual WAN hub

This article shows you how to use Virtual WAN to connect to your resources in Azure through a Network Virtual Appliance (NVA) in Azure. This type of connection requires a VPN device located on-premises that has an externally facing public IP address assigned to it. For more information about Virtual WAN, see the What is Virtual WAN?.

The steps in this article help you create a Barracuda CloudGen WAN Network Virtual Appliance in the Virtual WAN hub. To complete this exercise, you must have a Barracuda Cloud Premise Device (CPE) and a license for the Barracuda CloudGen WAN appliance that you deploy into the hub before you begin.

For deployment documentation of Cisco SD-WAN within Azure Virtual WAN, see Cisco Cloud OnRamp for Multi-Cloud.

For deployment documentation of VMware SD-WAN within Azure Virtual WAN, see Deployment Guide for VMware SD-WAN in Virtual WAN Hub


Verify that you have met the following criteria before beginning your configuration:

  • Obtain a license for your Barracuda CloudGen WAN gateway. To learn more about how to do this, see the Barracuda CloudGen WAN Documentation

  • You have a virtual network that you want to connect to. Verify that none of the subnets of your on-premises networks overlap with the virtual networks that you want to connect to. To create a virtual network in the Azure portal, see the Quickstart.

  • Your virtual network does not have any virtual network gateways. If your virtual network has a gateway (either VPN or ExpressRoute), you must remove all gateways. This configuration requires that virtual networks are connected instead, to the Virtual WAN hub gateway.

  • Obtain an IP address range for your hub region. The hub is a virtual network that is created and used by Virtual WAN. The address range that you specify for the hub cannot overlap with any of your existing virtual networks that you connect to. It also cannot overlap with your address ranges that you connect to your on-premises sites. If you are unfamiliar with the IP address ranges located in your on-premises network configuration, coordinate with someone who can provide those details for you.

  • If you don't have an Azure subscription, create a free account.

Create a virtual WAN

From a browser, navigate to the Azure portal and sign in with your Azure account.

  1. In the portal, select + Create a resource. Type Virtual WAN into the search box and select Enter.

  2. Select Virtual WAN from the results. On the Virtual WAN page, select Create to open the Create WAN page.

  3. On the Create WAN page, on the Basics tab, fill in the following fields:

    Screenshot shows the Create WAN pane with the Basics tab selected.

    • Subscription - Select the subscription that you want to use.
    • Resource group - Create new or use existing.
    • Resource group location - Choose a resource location from the dropdown. A WAN is a global resource and does not live in a particular region. However, you must select a region in order to manage and locate the WAN resource that you create.
    • Name - Type the Name that you want to call your WAN.
    • Type - Basic or Standard. Select Standard. If you select Basic VWAN, understand that Basic VWANs can only contain Basic hubs, which limits your connection type to site-to-site.
  4. After you finish filling out the fields, select Review +Create.

  5. Once validation passes, select Create to create the virtual WAN.

Create a hub

A hub is a virtual network that can contain gateways for site-to-site, ExpressRoute, point-to-site, or Network Virtual Appliance functionality. Once the hub is created, you'll be charged for the hub, even if you don't attach any sites. If you choose to create a site-to-site VPN gateway, it takes 30 minutes to create the site-to-site VPN gateway in the virtual hub. Unlike site-to-site, ExpressRoute, or point-to-site, the hub must be created first before you can deploy a Network Virtual Appliance into the hub VNet.

  1. Locate the Virtual WAN that you created. On the Virtual WAN page, under the Connectivity section, select Hubs.

  2. On the Hubs page, select +New Hub to open the Create virtual hub page.


  3. On the Create virtual hub page Basics tab, complete the following fields:

    Project details

    • Region (previously referred to as Location)
    • Name
    • Hub private address space. The minimum address space is /24 to create a hub, which implies anything range from /25 to /32 will produce an error during creation. Azure Virtual WAN, being a managed service by Microsoft, creates the appropriate subnets in the virtual hub for the different gateways/services. (For example: Network Virtual Appliances, VPN gateways, ExpressRoute gateways, User VPN/Point-to-site gateways, Firewall, Routing, etc.). There is no need for the user to explicitly plan for subnet address space for the services in the Virtual hub because Microsoft does this as a part of the service.
  4. Select Review + Create to validate.

  5. Select Create to create the hub.

Create the Network Virtual Appliance in the hub

In this step, you will create a Network Virtual Appliance in the hub. The procedure for each NVA will be different for each NVA partner's product. For this example, we are creating a Barracuda CloudGen WAN Gateway.

  1. Locate the Virtual WAN hub you created in the previous step and open it.

    Virtual hub

  2. Find the Network Virtual Appliances tile and select the Create link.

  3. On the Network Virtual Appliance blade, select Barracuda CloudGen WAN, then select the Create button.

    Select NVA

  4. This will take you to the Azure Marketplace offer for the Barracuda CloudGen WAN gateway. Read the terms, then select the Create button when you're ready.

    Barracuda NVA basics

  5. On the Basics page you will need to provide the following information:

    • Subscription - Choose the subscription you used to deploy the Virtual WAN and hub.
    • Resource Group - Choose the same Resource Group you used to deploy the Virtual WAN and hub.
    • Region - Choose the same Region in which your Virtual hub resource is located.
    • Application Name - The Barracuda NextGen WAN is a Managed Application. Choose a name that makes it easy to identify this resource, as this is what it will be called when it appears in your subscription.
    • Managed Resource Group - This is the name of the Managed Resource Group in which Barracuda will deploy resources that are managed by them. The name should be pre-populated for this.
  6. Select the Next: CloudGen WAN gateway button.

    CloudGen WAN Gateway

  7. Provide the following information here:

    • Virtual WAN Hub - The Virtual WAN hub you want to deploy this NVA into.
    • NVA Infrastructure Units - Indicate the number of NVA Infrastructure Units you want to deploy this NVA with. Choose the amount of aggregate bandwidth capacity you want to provide across all of the branch sites that will be connecting to this hub through this NVA.
    • Token - Barracuda requires that you provide an authentication token here in order to identify yourself as a registered user of this product. You'll need to obtain this from Barracuda.
  8. Select the Review and Create button to proceed.

  9. On this page, you will be asked to accept the terms of the Co-Admin Access agreement. This is standard with Managed Applications where the Publisher will have access to some resources in this deployment. Check the I agree to the terms and conditions above box, and then select Create.

Connect the VNet to the hub

In this step, you create the connection between your hub and a VNet. Repeat these steps for each VNet that you want to connect.

  1. On the page for your virtual WAN, select Virtual network connections.

  2. On the virtual network connection page, select +Add connection.

  3. On the Add connection page, fill in the following fields:

    • Connection name - Name your connection.
    • Hubs - Select the hub you want to associate with this connection.
    • Subscription - Verify the subscription.
    • Virtual network - Select the virtual network you want to connect to this hub. The virtual network cannot have an already existing virtual network gateway.
  4. Select OK to create the connection.

Next steps