O'Reilly logo

The Illustrated Network by Walter Goralski

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

CHAPTER 28 Firewalls

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 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.

If all data traveled the Internet encrypted inside VPNs, and all hosts only sent or received such data, the Internet would be a safer place. But the reality is messy—very messy—and denial of service attacks, hacker raids, spyware, spam, viruses, and worms ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required