Quickstart: Create an Azure Firewall with multiple public IP addresses - Bicep

In this quickstart, you use a Bicep file to deploy an Azure Firewall with multiple public IP addresses from a public IP address prefix. The deployed firewall has NAT rule collection rules that allow RDP connections to two Windows Server 2019 virtual machines.

Bicep is a domain-specific language (DSL) that uses declarative syntax to deploy Azure resources. It provides concise syntax, reliable type safety, and support for code reuse. Bicep offers the best authoring experience for your infrastructure-as-code solutions in Azure.

For more information about Azure Firewall with multiple public IP addresses, see Deploy an Azure Firewall with multiple public IP addresses using Azure PowerShell.

Prerequisites

Review the Bicep file

This Bicep file creates an Azure Firewall with two public IP addresses, along with the necessary resources to support the Azure Firewall.

The Bicep file used in this quickstart is from Azure Quickstart Templates.

@description('Admin username for the backend servers')
param adminUsername string

@description('Password for the admin account on the backend servers')
@secure()
param adminPassword string

@description('Location for all resources.')
param location string = resourceGroup().location

@description('Size of the virtual machine.')
param vmSize string = 'Standard_B2ms'

var virtualMachineName = 'myVM'
var virtualNetworkName = 'myVNet'
var networkInterfaceName = 'net-int'
var ipConfigName = 'ipconfig'
var ipPrefixName = 'public_ip_prefix'
var ipPrefixSize = 31
var publicIpAddressName = 'public_ip'
var nsgName = 'vm-nsg'
var firewallName = 'FW-01'
var vnetPrefix = '10.0.0.0/16'
var fwSubnetPrefix = '10.0.0.0/24'
var backendSubnetPrefix = '10.0.1.0/24'
var azureFirewallSubnetId = subnet.id
var azureFirewallIpConfigurations = [for i in range(0, 2): {
  name: 'IpConf${(i + 1)}'
  properties: {
    subnet: ((i == 0) ? json('{"id": "${azureFirewallSubnetId}"}') : json('null'))
    publicIPAddress: {
      id: publicIPAddress[i].id
    }
  }
}]

resource nsg 'Microsoft.Network/networkSecurityGroups@2022-01-01' = [for i in range(0, 2): {
  name: '${nsgName}${i + 1}'
  location: location
  properties: {
    securityRules: [
      {
        name: 'RDP'
        properties: {
          protocol: 'Tcp'
          sourcePortRange: '*'
          destinationPortRange: '3389'
          sourceAddressPrefix: '*'
          destinationAddressPrefix: '*'
          access: 'Allow'
          priority: 300
          direction: 'Inbound'
        }
      }
    ]
  }
}]

resource ipprefix 'Microsoft.Network/publicIPPrefixes@2022-01-01' = {
  name: ipPrefixName
  location: location
  properties: {
    prefixLength: ipPrefixSize
    publicIPAddressVersion: 'IPv4'
  }
  sku: {
    name: 'Standard'
  }
}

resource publicIPAddress 'Microsoft.Network/publicIPAddresses@2022-01-01' = [for i in range(0, 2): {
  name: '${publicIpAddressName}${i + 1}'
  location: location
  sku: {
    name: 'Standard'
  }
  properties: {
    publicIPAddressVersion: 'IPv4'
    publicIPAllocationMethod: 'Static'
    publicIPPrefix: {
      id: ipprefix.id
    }
    idleTimeoutInMinutes: 4
  }
}]

resource virtualNetwork 'Microsoft.Network/virtualNetworks@2022-01-01' = {
  name: virtualNetworkName
  location: location
  properties: {
    addressSpace: {
      addressPrefixes: [
        vnetPrefix
      ]
    }
    subnets: [
      {
        name: 'myBackendSubnet'
        properties: {
          addressPrefix: backendSubnetPrefix
          routeTable: {
            id: routeTable.id
          }
          privateEndpointNetworkPolicies: 'Enabled'
          privateLinkServiceNetworkPolicies: 'Enabled'
        }
      }
    ]
    enableDdosProtection: false
    enableVmProtection: false
  }
}

resource subnet 'Microsoft.Network/virtualNetworks/subnets@2022-01-01' = {
  parent: virtualNetwork
  name: 'AzureFirewallSubnet'
  properties: {
    addressPrefix: fwSubnetPrefix
    privateEndpointNetworkPolicies: 'Enabled'
    privateLinkServiceNetworkPolicies: 'Enabled'
  }
}

resource virtualMachine 'Microsoft.Compute/virtualMachines@2022-03-01' = [for i in range(0, 2): {
  name: '${virtualMachineName}${i+1}'
  location: location
  properties: {
    hardwareProfile: {
      vmSize: vmSize
    }
    storageProfile: {
      imageReference: {
        publisher: 'MicrosoftWindowsServer'
        offer: 'WindowsServer'
        sku: '2019-Datacenter'
        version: 'latest'
      }
      osDisk: {
        osType: 'Windows'
        createOption: 'FromImage'
        caching: 'ReadWrite'
        managedDisk: {
          storageAccountType: 'StandardSSD_LRS'
        }
        diskSizeGB: 127
      }
    }
    osProfile: {
      computerName: '${virtualMachineName}${i+1}'
      adminUsername: adminUsername
      adminPassword: adminPassword
      windowsConfiguration: {
        provisionVMAgent: true
        enableAutomaticUpdates: true
      }
      allowExtensionOperations: true
    }
    networkProfile: {
      networkInterfaces: [
        {
          id: netInterface[i].id
        }
      ]
    }
  }
}]

resource netInterface 'Microsoft.Network/networkInterfaces@2022-01-01' = [for i in range(0, 2): {
  name: '${networkInterfaceName}${i + 1}'
  location: location
  properties: {
    ipConfigurations: [
      {
        name: '${ipConfigName}${i + 1}'
        properties: {
          subnet: {
            id: virtualNetwork.properties.subnets[0].id
          }
          primary: true
        }
      }
    ]
    enableAcceleratedNetworking: false
    enableIPForwarding: false
    networkSecurityGroup: {
      id: nsg[i].id
    }
  }
}]

resource firewall 'Microsoft.Network/azureFirewalls@2022-01-01' = {
  name: firewallName
  location: location
  properties: {
    sku: {
      name: 'AZFW_VNet'
      tier: 'Standard'
    }
    threatIntelMode: 'Alert'
    ipConfigurations: azureFirewallIpConfigurations
    applicationRuleCollections: [
      {
        name: 'web'
        properties: {
          priority: 100
          action: {
            type: 'Allow'
          }
          rules: [
            {
              name: 'wan-address'
              protocols: [
                {
                  protocolType: 'Http'
                  port: 80
                }
                {
                  protocolType: 'Https'
                  port: 443
                }
              ]
              targetFqdns: [
                'getmywanip.com'
              ]
              sourceAddresses: [
                '*'
              ]
            }
            {
              name: 'google'
              protocols: [
                {
                  protocolType: 'Http'
                  port: 80
                }
                {
                  protocolType: 'Https'
                  port: 443
                }
              ]
              targetFqdns: [
                'www.google.com'
              ]
              sourceAddresses: [
                '10.0.1.0/24'
              ]
            }
            {
              name: 'wupdate'
              protocols: [
                {
                  protocolType: 'Http'
                  port: 80
                }
                {
                  protocolType: 'Https'
                  port: 443
                }
              ]
              fqdnTags: [
                'WindowsUpdate'
              ]
              sourceAddresses: [
                '*'
              ]
            }
          ]
        }
      }
    ]
    natRuleCollections: [
      {
        name: 'Coll-01'
        properties: {
          priority: 100
          action: {
            type: 'Dnat'
          }
          rules: [
            {
              name: 'rdp-01'
              protocols: [
                'TCP'
              ]
              translatedAddress: '10.0.1.4'
              translatedPort: '3389'
              sourceAddresses: [
                '*'
              ]
              destinationAddresses: [
                publicIPAddress[0].properties.ipAddress
              ]
              destinationPorts: [
                '3389'
              ]
            }
            {
              name: 'rdp-02'
              protocols: [
                'TCP'
              ]
              translatedAddress: '10.0.1.5'
              translatedPort: '3389'
              sourceAddresses: [
                '*'
              ]
              destinationAddresses: [
                publicIPAddress[1].properties.ipAddress
              ]
              destinationPorts: [
                '3389'
              ]
            }
          ]
        }
      }
    ]
  }
}

resource routeTable 'Microsoft.Network/routeTables@2022-01-01' = {
  name: 'rt-01'
  location: location
  properties: {
    disableBgpRoutePropagation: false
    routes: [
      {
        name: 'fw'
        properties: {
          addressPrefix: '0.0.0.0/0'
          nextHopType: 'VirtualAppliance'
          nextHopIpAddress: '10.0.0.4'
        }
      }
    ]
  }
}

Multiple Azure resources are defined in the template:

Deploy the Bicep file

  1. Save the Bicep file as main.bicep to your local computer.

  2. Deploy the Bicep file using either Azure CLI or Azure PowerShell.

    az group create --name exampleRG --location eastus
    az deployment group create --resource-group exampleRG --template-file main.bicep --parameters adminUsername=<admin-username>
    

    Note

    Replace <admin-username> with the admin username for the backend server.

    You will be prompt to enter the admin password.

    When the deployment finishes, you should see a message indicating the deployment succeeded.

Validate the deployment

In the Azure portal, review the deployed resources. Note the firewall public IP addresses.

Use Remote Desktop Connection to connect to the firewall public IP addresses. Successful connection demonstrates firewall NAT rules that allow the connection to the backend servers.

Clean up resources

When you no longer need the resources that you created with the firewall, delete the resource group. This removes the firewall and all the related resources.

To delete the resource group, call the Remove-AzResourceGroup cmdlet:

Remove-AzResourceGroup -Name "exampleRG"

Next steps