Firewall and Proxy Server HOWTO

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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