Troubleshooting Linux Firewalls

    Why We Wrote This Book

    How This Book Is Organized

    Goals of This Book

    The Methodical Approach and the Need for a Methodology

    Firewalls, Security, and Risk Management

    How to Think About Risk Management

    Computer Security Principles

    Firewall Recommendations and Definitions

    Why Do I Need a Firewall?

    Do I Need More Than a Firewall?

    What Kinds of Firewalls Are There?

    The Myth of "Trustworthy" or "Secure" Software

    Know Your Vulnerabilities

    Creating Security Policies

    Training

    Defense in Depth

    Summary

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