Load Balancing 101: Firewall Sandwiches

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Executive Summary

Historically, the most common use of the network-based hardware load balancer and its modern incarnation, the Application Delivery Controller (ADC), has been to provide high availability, scalability, and manageability for the back-end application, particularly at the content tier. Coming in a very close second is providing those same benefits for other network infrastructure components like routers and firewalls. There are many advantages to deploying firewalls, in particular, behind ADCs. This white paper will show how one can implement ADCs in a "Firewall sandwich" to improve availability, scalability, and manageability across the IT infrastructure.

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