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Barracuda CloudGen Firewall

This Firmware Version Is End-Of-Support

Documentation for this product is no longer updated. Please see End-of-Support for CloudGen Firewall Firmware for further information on our EoS policy.

How to Configure Azure Route Tables (UDR) using Azure Portal and ARM

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Azure Route Tables, or User Defined Routing, allow you to create network routes so that your F-Series Firewall VM can handle the traffic both between your subnets and to the Internet. For the network interfaces to be allowed to receive and forward traffic, IP forwarding must be enabled. When different route types are present in a UDR route table, user defined routes are preferred over the default system routes. When multiple routes match the destination, the more specific route is used. The default system routes always present in an Azure route table allow the following:

  • Traffic within the virtual network
  • Traffic to the Internet
  • Traffic between different virtual networks using Azure VPN Gateway
  • Traffic from the virtual network to networks connected via Azure VPN Gateway

In this article:


  • Multiple network interfaces are not supported for high availability clusters.
  • Multiple network interfaces in one subnet are not supported for stand-alone firewall VMs.

Before vou begin

  • Deploy a Barracuda NextGen Firewall F. For more information, see Microsoft Azure Deployment.
  • To enable IP forwarding: Install Azure PowerShell 1.1.0 or higher.

Step 1. Create an Azure Route Table

Create a route table in the networking resource group.

  1. Log into the Azure Portal:
  2. Click New.
  3. In the New column, select Route table in the search box and press Enter.
  4. In the Everything column, select Route table.
  5. Click Create.
  6. In the Route table column, enter:
    • Name – Enter the route table name.
    • Subscription – Select the Azure subscription.
    • Resource Group – Click Select existing to use an already existing resource group, or enter a unique resource group name to create a new resource group.
    • Location – Select the Azure datacenter where you want to deploy your VM. The route table must be in the same location as the virtual network and the VMs.
  7. Click Create.

Wait for the route table deployment to finish.


Step 2. Add routes

Create user defined routes to use your firewall VM as a gateway.

  1. Log into the Azure Portal:
  2. Open the route table created in step 1.
  3. In the Settings column, click Routes.
  4. In the Routes column, click + Add.
  5. In the Add route column, enter:
    • Route name – Enter a unique route name.
    • Address prefix – Enter the destination IP address range in CIDR. Use to create a default route. 
    • Next hop type – Select Virtual appliance
    • Next hop address – Enter the private IP address of the F-Series Firewall VM. If you are using an HA cluster, enter the IP address of the active firewall VM.
  6. Click OK
  7. (optional) Create additional routes.

The routes you created are now visible in your route tables column.


Step 3. Associate the route table with the subnets

Assign the routing table to the subnets. It is not possible to associate more than one routing table with a subnet.

  1. Log into the Azure Portal:
  2. Open the route table created in step 1.
  3. In the Settings column, click Subnets .
  4. In the Subnets column, click Associate to add a subnet.
  5. In the Associate subnet column, click Virtual network.
  6. Select the virtual network in the Resource column
  7. In the Associate subnet column, click Subnet.
  8. In the Choose subnet column, select the subnet.
  9. Click OK.
  10. (optional) Associate additional subnets with the route table.

The subnets associated with this route table are now visible in the subnets section of your route tables column:


Step 4. Enable IP forwarding for the network interfaces of the firewall VM

Enable IP forwarding for all attached network interfaces of the firewall VM. This enables the firewall to forward traffic with a destination IP address that does not match its own private IP address.

  1. Log into the Azure Portal:
  2. Open the network interface attached to your firewall VM.
  3. In the Network Interface column, click Settings
  4. In the Settings column, click IP addresses.
  5. In the IP addresses column, set IP forwarding to Enabled.
  6. Click Save.

The Barracuda NextGen Firewall F VM can now forward traffic from backend VMs to the Internet.

Next Steps

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