Next Previous Contents v0.80, Feb. 26, 2000

This document is designed to describe the basics of firewall systems and give you some detail on setting up both a filtering and proxy firewall on a Linux based system. An HTML version of this document is available at http://www.grennan.com/Firewall-HOWTO.html

1. Introduction

2. Understanding Firewalls

• 2.1 Firewall Politics
• 2.2 Types of Firewalls

3. Firewall Architecture

4. Setting up the Linux Filtering Firewall

• 4.1 Hardware requirements

5. Software requirements

• 5.1 Selecting a Kernel
• 5.2 Selecting a proxy server

6. Preparing the Linux system

7. IP filtering setup (IPFWADM)

8. IP filtering setup (IPCHAINS)

9. Installing a Transparent SQUID proxy

10. Installing the TIS Proxy server

11. The SOCKS Proxy Server

12. Advanced Configurations

• 12.1 A large network with emphasis on security

13. Making Management Easy

• 13.1 Firewall tools
• 13.2 General tools

14. Defeating a Proxy Firewall

15. APPENDEX A – Example Scripts

• 15.1 RC Script useing GFCC
• 15.2 GFCC script
• 15.3 RC Script without GFCC

16. APPENDEX B – An VPN RC Script for RedHat

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