Adding Multiple IP's to an NGFW WAN Interface in Azure
Just like a physical NGFW appliance, an Azure-hosted instance has the ability to support multiple IP addresses on a single, usually WAN, interface. Most of the configuration is done in Azure itself.
The article below from Microsoft outlines how to add the IP addresses in your Azure container.
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-multiple-ip-addresses-portal
Once that process is done, you then need to go into your NGFW to add the IP's as aliases on the WAN interface.
- In the Admin UI, go to Config > Network > Interfaces, then click Edit for the External interface.
- At the bottom of the IPv4 Configuration tab, Click the Add button directly under "IPv4 Aliases".
- Enter the address and netmask for the new IP.
- Repeat this process for every additional IP you wish to add.
- Click Done to close out of the "Edit Interface" window, then click Save to apply the new IP addresses.
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