Strip away some of the mystery and magic behind load balancing practices.

There are many advantages to deploying firewalls, in particular, behind Application Delivery Controllers. This white paper will show how you can implement ADCs in a “firewall sandwich” to improve availability, scalability, and manageability across the IT infrastructure.

Introduction
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 presentation 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 (see the white paper Load Balancing 101: The Evolution to Application Delivery Controllers for other uses). This white paper will show how you can implement ADCs in a “firewall sandwich” to improve availability, scalability, and manageability across the IT infrastructure.

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By KJ (Ken) Salchow, Jr.
Manager, Technical Marketing

Offered Free by: F5 Networks

Contents
Introduction 3
Availability 3
Scalability 3
Manageability 4
The Basic Design of a Firewall Sandwich 4
Typical Traffic Flow: Inbound 6
Typical Traffic Flow: Outbound 7
Potential Issues with Implementation 8
Encrypted Traffic 8
Asymmetric Routing 8
Complexity with Growth 10
Recovering from Firewall Failure 10
Conclusion 11

Conclusion
While the configuration presented in this document is the simplest example of hundreds of potential deployment options, it is sufficient for demonstrating the benefits of deploying firewalls behind Application Delivery Controllers. Your deployment will ultimately depend on your organization’s specific needs and existing infrastructure as well as acquisition, operations, and management cost considerations. ...

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