Configuring IP-based access for your Azure Function App involves setting up access restrictions to control which IP addresses can access your app. Here are the steps to follow:
1. Navigate to Your Function App: Go to the Azure portal and select your Function App.
2. Access Networking Settings: In the left menu, click on Networking.
3. Configure Access Restrictions: Under the Networking section, select Access Restrictions. This is where you define rules to allow or deny access based on IP addresses.
4. Add an IP-Based Rule: Click on Add Rule to create a new rule. In the Type dropdown, select IPv4 or IPv6, depending on the type of IP address you want to restrict.
5. Specify IP Address Block: Enter the IP address block in Classless Inter-Domain Routing (CIDR) notation. For example, to allow access from a specific IP address, you might use `1.2.3.4/32`. To allow access from all IP addresses, use `0.0.0.0/0`, but this is not recommended for security reasons.
6. Set Priority and Action: Determine the priority of the rule and whether it should allow or deny access. Lower numbers indicate higher priority.
7. Save the Rule: Once you've configured the rule, click OK to save it. Ensure that you have an implicit "deny all" rule at the end of your list if you want to restrict access to only the specified IP addresses.
8. Test the Configuration: After setting up the rules, test your Function App to ensure that it behaves as expected with the new access restrictions in place.
By following these steps, you can effectively control which IP addresses can access your Azure Function App, enhancing its security and limiting unauthorized access.
Citations:
[1] https://digitalmaterial.ch/blog/azure-function-app-with-large-powershell-modules/
[2] https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions
[3] https://learn.microsoft.com/en-us/azure/azure-functions/functions-how-to-use-nat-gateway
[4] https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/azure-functions/functions-networking-options.md
[5] https://learn.microsoft.com/en-us/azure/azure-functions/ip-addresses
[6] https://docs.azure.cn/en-us/azure-functions/functions-how-to-use-nat-gateway
[7] https://docs.azure.cn/en-us/azure-functions/functions-create-private-site-access
[8] https://stackoverflow.com/questions/67711131/how-to-configure-azure-function-access-restrictions-to-allow-for-testing-via-por