![]() IP address restriction and authentication would be sufficient, using host key along with them would be much better. In case of Function app, the following configuration should be done to avoid direct connection from the Internet.Ĭonfigure to accept only traffic from Public IP address assigned to the API Management instance.Ĭonfigure authentication in Function app to accept only accesses from resources in the same Azure AD tenant.Īuthorization level should be set to function. When adding subscription key, configuration of HTTP header in Application Gateway is required. Sample API management policy - Filter on IP Address when using Application Gateway - Azure API Manag.Įnforcing using subscription key along with source IP address restriction would be much more strong restriction. For more details, check the following URL. We can also use original request IP addresses to filter requests through Application Gateway. IP address(es) assigned to Application Gateway instance or NAT Gateway are filled in as permitted source IP address(es). ![]() How to set or edit Azure API Management policies | Microsoft Docs This policy should be defined in global scope as we have to check all traffics to the API Management instance. To accept only traffic from the Application Gateway instance, we can use ip-filter policy to restrict source IP in API Management.Īzure API Management access restriction policies | Microsoft Docs Along with source IP restriction, API host key and authentication are also acceptable.Īs I mentioned above, public IP address is already assigned to Application Gateway instance and the IP address is also used for outbound communication. Configure Function app to accept only traffic from API Management instance.Along with source IP restriction, subscription key is also acceptable. Configure API Management instance to accept only traffic from Application Gateway instance.Therefore, NAT Gateway for communication with API Management instance is optional (not required). As Application Gateway is already configured for public access, assigned public IP address is used to communicate API Management instance. ![]() Note: This is an example and is not the only one solution. However, this customer uses Consumption SKU for Azure Functions, and Basic SKU for API Management. If they used premium SKU for both API Management and Azure Functions, they would not have to worry about that (as these services can access VNet when using Premium SKU). In this situation, how do they configure each component behind Application Gateway to avoid accessing it from Internet directly? As they don't use either premium SKU or developer SKU, however, their API Management instance is not permitted to access VNet. They plan to use Application Gateway as a web application firewall (WAF) in front of API Management. Now they are trying to use Azure API Management and Azure Functions for backend services to expose APIs. I would like to add information in case of using Application Gateway.Īs always, I received the following query from my customer. Integrate Azure Front Door with Azure API Management - Microsoft Tech Community ![]() The following great article is helpful for us when configuring Azure Front Door in front of API Management to accept only traffic from Azure Front Door at API Management. ![]()
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