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Tobin Maginnis is Associate Professor of Computer and Information Science at the University of Mississippi. He has used free-to-use open source software to teach many systems courses, including three levels of operating systems and computer networking courses over the last 20 years. Since 1992, he has been President of Sair Linux and GNU, Inc.

Preface.

Acknowledgments.

Introduction.

KNOWLEDGE MATRIX.

Theory of Operation.

Base Systems.

Shells and Commands.

Systems Utilities.

Applications.

Troubleshooting.

LABS AND EXERCISES.

Network Policy.

Setting up a Three-syslog Configuration.

Basic ipchains.

stunnel.

Installing xinetd.

Editing Global Options.

netstat.

swatch.

Using Tripwire.

Using Crack to Check for Weak Passwords.

Using GnuPG.

ipchains Part 2.

nmap.

Understanding and Using Secure Shell.

super and sudo.

Securing the LILO Boot Manager.

Squid.

chrooted FTP Server.

Securing Sendmail.

Using PAM to Limit CPU Usage.

Securing NFS Exports.

hosts.allow, hosts.deny, and hosts.lpd.

Rootkits and Rootkit Detectors.

PRACTICE QUESTIONS AND ANSWERS.

Practice Questions.

Answers.

Glossary.

Index.