Firewalling and Proxy Server HOWTO Firewalling and Proxy Server HOWTO Mark Grennan, [e-mail]0.4, 8 November 1996This document is designed to teach the basics of firewall systems and give you some detail on setting up both a filtering and proxy firewall on a Linux based PC. An HTML version of this document is available at http://okcforum.org/~markg/Firewall-HOWTO.html1. Introduction1.1 Feedback1.2 Disclaimer1.3 Copyright1.4 My Reasons for Writing This1.5 TODO1.6 Further Readings2. Understanding Firewalls2.1 Drawbacks with Firewalls2.2 Types of Firewalls3. Setting up the Firewall3.1 Hardware requirements4. Firewalling Software4.1 Available packages4.2 The TIS Firewall Toolkit vs SOCKS5. Preparing the Linux system5.1 Compiling the Kernel5.2 Configuring two network cards5.3 Configuring the Network Addresses5.4 Testing your network5.5 Securing the Firewall6. IP filtering setup (IPFWADM)7. Installing the TIS Proxy server7.1 Getting the software7.2 Compiling the TIS FWTK7.3 Installing the TIS FWTK7.4 Configuring the TIS FWTK8. The SOCKS Proxy Server8.1 Setting up the Proxy Server8.2 Configuring the Proxy Server8.3 Working With a Proxy Server8.4 Drawbacks with Proxy Servers9. Advanced Configurations9.1 A large network with emphasis on security 2