Configuring SonicWALL Firewalls
Delivering an in-depth look at the SonicWALL firewall product line, this book covers all aspects including the SOHO devices and the Enterprise SonicWALL firewalls.
TABLE OF CONTENTS Configuring SonicWALL Firewalls
Understanding Firewall Basics
A firewall is a device that is part hardware, part software and is used to secure network access. Throughout this book, we will cover every aspect of the SonicWALL firewall product line, its usage, and configuration. Before we begin to look at the various aspects of the SonicWALL firewall, we need to look at some general firewall information. This will give you a better perspective on the pros and cons of the SonicWALL firewall. Firewalls have come a long way since the original inception of the idea.
In the first part of this section we discuss the firewall in today s network. We look at the types of firewalls and how its importance has increased as well as there increased deployments in each network. Next, the many types of firewalls are discussed and contrasted and compared. Finally, we will review some common firewall concepts that will be used throughout the book.
Types of Firewalls
In the past, an organization may have had one firewall that protected the edge of the network. Some companies did not have their network attached to the Internet, or may have had perhaps one or two stations that would dial up to the Internet or to another computer that they needed to exchange data with. After the late 1990 s, however, the need for the Internet, its information, and e-mail was undeniable.
With the requirement for instantaneous e-mail access comes the requirement for an always-on Internet connection. At first, companies would place their systems directly...
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