Azure Application Gateway Introduction



The Azure Application Gateway is classified as a virtual appliance that provides an application delivery controller service. The service is fully managed, scalable as well as highly available.It also provides various layer 7 load balancing options. The application gateway contains a Web Application Firewall which protects web applications from various security threats. The application gateway can be used as an internet facing gateway or also as an internal only gateway.

The Azure Application Gateway also provides the following features: http load balancing, cookie based session affinity, SSL offload, end to end SSL, URL based content routing, multi-site routing, websocket support, health monitoring, SSL policy and ciphers, request redirect, multi-tenant back-end support and advanced diagnostics.

As mentioned above, the Azure Application Gateway is used for layer 7 load balancing. Using Traffic Manager to distribute the traffic to various application gateway services which in turn provide layer 7 load balancing. There are three different types of load balancers in Azure: Azure Load Balancer - Layer 4 traffic distribution, Application Gateway - Layer 7 load balancing and Traffic Manger which uses DNS to direct traffic distribution to endpoints based on an end user location. Traffic Manager can be used in conjunction with Application Gateway:


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