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Tech Tips, Tricks & Trivia

by 'Anil' Radhakrishna
An architect's notes, experiments, discoveries and annotated bookmarks.

Search from over a hundred HOW TO articles, Tips and Tricks

Azure Application Gateway - Highlights

  1. Application Gateway operates as an application delivery controller (ADC) as a service and offers SSL termination, security enhancements and  other layer 7 routing capabilities including cookie-based session affinity, round-robin load distribution, content-based routing, ability to host multiple websites.
  2. Application Gateway is a layer 7 load balancer, which means it works with web traffic only (HTTP/HTTPS/WebSocket) unlike a Load Balancer which load balances traffic at layer 4 (TCP/UDP). 
  3. Application gateway supports hosting up to 20 websites behind a single gateway that could all be protected against web attacks with WAF.
  4. Web application firewall (WAF) is a feature of Application Gateway that provides centralized protection (without modification to backend code) of your web applications from common exploits and vulnerabilities. WAF SKU comes only in medium and large application gateway instance sizes. 
  5. Application Gateway can be configured as internet facing gateway, internal only gateway, or a combination of both.
  6. Application Gateway is useful for applications that require requests from the same user/client session to reach the same back-end virtual machine. Examples of these applications would be shopping cart applications and web mail servers.
  7. Microsoft guarantees that each Application Gateway Cloud Service having two or more Medium or Large instances will be available at least 99.9% of the time.  No SLA is provided for Application Gateway services with only one instance or with Small instance sizes which are intended for development and testing scenarios.
  8. Application gateways are charged based on the amount of time that the gateway is provisioned and available, as well as the amount of data processed by the application gateways. Data transferred out of Azure data centers from the application gateways will be charged at standard data transfer rates.
  9. Application Gateway is always deployed in a virtual network subnet. This subnet can only contain Application Gateways
  10. Application Gateway does not support static public IP addresses, but it does support static internal IPs.
Compiled from official Azure documentation. Follow the links for updates

Related - Compared: Azure Load Balancer, Application Gateway, Traffic Manager 

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