Manage a public IP address by using Azure Firewall

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In this article, you learn how to manage public IP addresses for Azure Firewall by using the Azure portal. You learn how to create an Azure Firewall by using an existing public IP in your subscription, change the IP configuration, and finally, add an IP configuration to the firewall.

Azure Firewall is a cloud-based network security service that protects your Azure Virtual Network resources. Azure Firewall requires at least one public static IP address to be configured. This IP or set of IPs is the external connection point to the firewall.

Azure Firewall supports Standard SKU public IP addresses. Basic SKU public IP address and public IP prefixes aren't supported.

Prerequisites

• An Azure account with an active subscription. Create one for free.
• Three Standard SKU public IP addresses that aren't associated with any resources. For more information on creating a Standard SKU public IP address, see Quickstart: Create a public IP address by using the Azure portal.
  • For the purposes of the examples in this article, create three new public IP addresses: myStandardPublicIP-1, myStandardPublicIP-2, and myStandardPublicIP-3.

Create an Azure firewall with an existing public IP

In this section, you create an Azure firewall. Use the first IP address you created in the prerequisites as the public IP for the firewall.

1. In the Azure portal, search for and select Firewalls.

2. On the Firewalls page, select Create.

3. In Create firewall, enter or select the following information.

   Setting	Value
   Project details
   Subscription	Select your subscription.
   Resource group	Create a new resource group named myResourceGroupFW.
   Instance details
   Name	Enter myFirewall.
   Region	Select West US 2.
   Availability zone	Leave the default of None.
   Firewall SKU	Select Standard.
   Firewall management	Leave the default of Use a Firewall Policy to manage this firewall.
   Firewall policy	Create a new firewall policy named myFirewallPolicy in West US 2, and set the Policy tier to Standard.
   Choose a virtual network	Leave default of Create new.
   Virtual network name	Enter myVNet.
   Address space	Enter 10.0.0.0/16.
   Subnet address space	Enter 10.0.0.0/26.
   Public IP address	Select myStandardPublicIP-1 or your public IP.
   Forced tunneling	Leave the default of Disabled.

4. Select Review + create.

5. Select Create.

The following image shows the Create firewall page with the example information.

Change the public IP address for a firewall

In this section, you change the public IP address associated with the firewall. A firewall must have at least one public IP address associated with its configuration. You can't update the IP address if the firewall's existing IP has any destination network address translation (DNAT) rules associated with it.

1. In the Azure portal, search for and select Firewalls.

2. On the Firewalls page, select myFirewall.

3. On the myFirewall page, go to Settings, and then select Public IP configuration.

4. In Public IP configuration, select myStandardPublicIP-1.

5. Select the Public IP address dropdown, and then select myStandardPublicIP-2.

   

6. Select Save.

Add a public IP configuration to a firewall

In this section, you add a public IP configuration to Azure Firewall. For more information about multiple IPs, see Multiple public IP addresses.

1. In the Azure portal, search for and select Firewalls.

2. On the Firewalls page, select myFirewall.

3. On the myFirewall page, go to Settings, and then select Public IP configuration.

4. Select Add a public IP configuration.

5. In Name, enter myNewPublicIPconfig.

6. In Public IP address, select myStandardPublicIP-3.