FIREWALLS

12/3/09 12:15 PM Page 22-1. CHAPTER. FIREWALLS . The Need for FIREWALLS Firewall Characteristics Types of FIREWALLS Packet Filtering Firewall Stateful Inspection FIREWALLS Application-Level Gateway Circuit-Level Gateway Firewall Basing Bastion Host Host-Based FIREWALLS Personal Firewall Firewall Location and Configurations DMZ Networks Virtual Private Networks Distributed FIREWALLS Summary of Firewall Locations and Topologies Recommended Reading and Web Site Key Terms, Review Questions, and Problems 22-1. 12/3/09 12:15 PM Page 22-2. 22-2 CHAPTER 22 / FIREWALLS . The function of a strong position is to make the forces holding it practically unassailable.

A packet filtering firewall applies a set of rules to each incoming and outgoing IP packet and then forwards or discards the packet (Figure 22.1b).The firewall is typi-cally configured to filter packets going in both directions (from and to the internal network). Filtering rules are based on information contained in a network packet:

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