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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
The Barnes & Noble Review
Even those who are facile with Linux often have little experience with securing Linux boxes -- beyond (perhaps) not running Quake or StarOffice as root. In short, there are a lot of people who desperately need Linux Security, by Ramón J. Hontañón.
Hontañón, a frequent contributor to Network and SysAdmin magazines, starts by introducing the fundamentals of Linux security, and the elements of security that depend on proper system installation and setup. Next, he reviews Linux's workstation and network monitoring and auditing tools -- tools that can often flag potential or real security problems, if only administrators would use them regularly and well.
In many (if not most) environments, Linux delivers the most value by serving applications: email, web services, or Samba-based file and print services. Hontañón shows how to secure each of these. He then moves on to perimeter security and Linux firewalls, showing how to firewall the network layer, transport layer, and application layer; and create bastion servers hardened against attack.
In the final section of the book, Hontañón focuses on remote access via VPNs (both IPSec via FreeS/WAN and PPTP via PopTop); and on the strong authentication mechanisms that can be used to protect VPNs.(Bill Camarda)