Firewalling and Proxy Server HOWTO

David Rudder, `drig@execpc.com`

v0.2, 17 July 1995

This document is designed to teach the basics of setting up a firewall on a Linux based PC. Also covered is the installation and use of Proxy Servers to allow greater access to the Internet from behind a firewall.

1. Introduction

1.1 Feedback
1.2 Disclaimer
1.3 Copyright
1.4 My Reasons for Writing This
1.5 TODO
1.6 Further Readings

2. Understanding Firewalls

2.1 Drawbacks with Firewalls
2.2 Proxy Servers

3. Setting This All Up

3.1 Hardware requirements
3.2 Setting up the Software
3.3 Configuring the Network Addresses
3.4 Testing it out
3.5 Securing the Firewall

4. Firewalling Software

4.1 Available packages
4.2 The TIS Firewall Toolkit
4.3 TCP Wrapper
4.4 Ipfw and Ipfw Admin

5. The Proxy Server

5.1 Setting up the Proxy Server
5.2 Configuring the Proxy Server
5.3 Working With a Proxy Server
5.4 Getting the Proxy Server to work with UDP Packets
5.5 Drawbacks with Proxy Servers

6. Advanced Configurations

6.1 A large network with emphasis on security