Red Hat Enterprise Linux ( RHEL) is a Linux distribution produced by Red Hat and targeted toward the commercial market, including mainframes. Red Hat commits to supporting each version of RHEL for 7 years after its release. All of Red Hat’s official support, all of Red Hat’s training and the Red Hat Certification Program center on the Red Hat Enterprise Linux platform.
New versions of RHEL are released every 18 to 24 months. When Red Hat releases a new version of RHEL, customers may upgrade to the new version at no additional charge as long as they are in possession of a current subscription (e.g. the subscription term has not yet lapsed).
Link: http://www.linuxtopia.org/online_books/redhat_linux_step_by_step_guide/index.html
This manual was previously published under the title Red Hat Linux Getting Started Guide. It has been renamed and incorporated into the Red Hat Enterprise Linux documentation set. It has been modified to include new features in Red Hat Enterprise Linux 4 and to reflect changes in documented procedures that are not supported in Red Hat Enterprise Linux.
Popularity: 73%
Link: http://www.linuxtopia.org/Linux_Security_HOWTO/index.html
A reasonable level of computer security is not difficult to maintain on a home machine. More effort is required on business machines, but Linux can indeed be a secure platform. Due to the nature of Linux development, security fixes often come out much faster than they do on commercial operating systems, making Linux an ideal platform when security is a requirement.
This document will attempt to explain some procedures and commonly-used software to help your Linux system be more secure. It is important to discuss some of the basic concepts first, and create a security foundation.
Popularity: 28%
This document covers everything setting up an iptables firewall to the theory behind the steps. The author also includes a handy rc.flush script to use when setting up and debugging the firewall. Getting firewalled from your own machine really sucks.
Link: http://www.linuxtopia.org/Linux_Firewall_iptables/index.html
From the author:
I originally wrote this as a very small tutorial for boingworld.com, which was an Amiga/Linux/General newssite that a small group of people, including me, ran a couple of years back. Due to the fantastic amount of readers and comments that I got from it, I continued to write on it. The original version was approximately 10-15 A4 pages in printed version and has since been growing slowly but steadily. A huge amount of people has helped me out, spellchecking, bug corrections, etc. At the time of writing this, the http://iptables-tutorial.frozentux.net/ site has had over 600.000 unique hits alone.
This document was written to guide you through the setup process step by step and hopefully help you to understand some more about the iptables package. I have based most of the stuff here on the example rc.firewall file, since I found that example to be a good way to learn how to use iptables. I decided to just follow the basic chain structure and from there walk through each and one of the chains traversed and explain how the script works. That way the tutorial is a little bit harder to follow, though this way is more logical. Whenever you find something that’s hard to understand, just come back to this tutorial.
Table of Contents:
1. Introduction
2. TCP/IP repetition
3. IP filtering introduction
4. Network Address Translation Introduction
5. Preparations
6. Traversing of tables and chains
7. The state machine
8. Saving and restoring large rule-sets
9. How a rule is built
10. Iptables matches
11. Iptables targets and jumps
12. Debugging your scripts
13. rc.firewall file
14. Example scripts
15. Graphical User Interfaces for Iptables/netfilter
Popularity: 27%
Linux is both more secure and less common than Windows based systems with the consequence that attacks on Linux systems occur less frequently than on Windows systems. Having said that it would be foolish to be complacent about securing any system regardless of whether it runs Windows, Linux or any other operating system.
The purpose of this book is to provide a step by step approach to securing a Linux system from outside attack. It is designed to be used and understood by both new and experienced Linux users.
Link: http://www.linuxtopia.org/LinuxSecurity/index.html
Popularity: 28%
