Chapter 32

Firewalls

Abstract

In this chapter, you will learn how firewalls add security to TCP/IP networks. We’ll be working with both kinds of router-based firewalls: packet filters and stateful inspection.

You will learn about the types of dedicated firewalls that run on purpose-built hardware. We’ll also examine firewall architectures and the use of DMZs. And because filtering works exactly the same with IPv6 as with IPv4, we will not have a special section on IPv6 firewalls.

Keywords

Firewalls; TCP/IP network; DMZs; Defcon; Juniper Networks; AS PIC; UDP anomalies

What You Will Learn

In this chapter, you will learn how firewalls add security to TCP/IP networks. We’ll be working with both kinds of router-based firewalls: packet filters and stateful ...

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