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Firewall and Proxy Server HOWTO

Mark Grennan,

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

1. Introduction

2. Understanding Firewalls

3. Firewall Architecture

4. Setting up the Linux Filtering Firewall

5. Software requirements

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

13. Making Management Easy

14. Defeating a Proxy Firewall

15. APPENDEX A - Example Scripts

16. APPENDEX B - An VPN RC Script for RedHat

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