Firewall Fundamentals

Chapter 1. to Firewalls Depending on whom you talk to, a firewall is either the cornerstone of their organization's security infrastructure, or it is a device that has woefully failed to live up to expectations. How ca...

Chapter 2. Firewall Basics This chapter covers the basics of firewalls. Firewalls can be distinguished in a variety of ways: from the size of the network they are designed to operate in to the way they provide protectio...

Chapter 3. TCP/IP for Firewalls Much like humans may speak English, German, or Russian, computers may quot;speakquot; any number of languages: IPX/SPX, AppleTalk, and TCP/IP being just a few of them. Because of the port...

Chapter 4. Personal Firewalls: Windows Firewall and Trend Micro's PC-cillin Firewall technology has moved both upward into the large enterprise and service-provider space as well as all the way down to the desktop level...

Chapter 5. Broadband Routers and Firewalls Depending on the report you want to accept, between 53 percent and 62 percent of Internet access in the United States is provided by broadband connections. Outside the United S...

Chapter 6. Cisco PIX Firewall and ASA Security Appliance One of the most widely deployed firewalls on the Internet is the Cisco PIX Firewall. The PIX, along with the new Cisco Adaptive Security Appliance (ASA), is poise...

Chapter 7. LinuxBased Firewalls Linuxbased firewalls come in a variety of flavors. Originally, Linux-based firewalls were based on the ipfw code (which itself was taken from the Berkeley Software Distribution [BSD] of U...

Chapter 8. Application Proxy Firewalls Application proxy firewalls are perhaps the most complex firewalls to implement. This complexity is due in large part to the fact that unlike other firewall technologies, applicati...

Chapter 9. Where Firewalls Fit in a Network Arguably, the most important task of any firewall implementation takes place before the firewall itself is ever configured. For a firewall to be able to successfully protect r...

Chapter 10. Firewall Security Policies The term security policy has a number of meanings in the industry. On one hand, it refers to the written policies that dictate how the organization manages the security of their re...

Chapter 11. Managing Firewalls This chapter looks at the management of firewalls. From the perspective of the small office/home user, the firewall is a single device that protects the home network from malicious traffic...

Chapter 12. What Is My Firewall Telling Me? You have purchased, installed, configured, and are running a firewall. You think it is doing a marvelous job of protecting resources and keeping your network safe and secure....

Chapter 13. Troubleshooting Firewalls One of the more difficult skills to cultivate is how to troubleshoot problems related to your firewall or firewall implementation. The reason for this difficulty is that firewalls,...

Chapter 14. Going Beyond Basic Firewall Features Modern firewalls provide a wide variety of significant services to the end user, whether it is a personal firewall or a network firewall used to protect an enterprise net...