AppendixB.Firewall Examples and Support Scripts

Appendix B. Firewall Examples and Support Scripts

A firewall for a standalone system is described in Chapter 4, "Building and Installing a Standalone Firewall." The standalone example is optimized in Chapter 5, "Firewall Optimization." The same example is extended in Chapter 6, "Packet Forwarding," to function as either a gateway or a choke firewall, with a full set of firewall rules applied to both the external public interface and the internal local network interface. The gateway serves as the link between the Internet and a DMZ network containing public servers. The choke serves as the link between a private LAN and the DMZ.

The sample firewalls are presented piecemeal in Chapters 4, 5, and 6. This appendix presents the same firewall examples as they would appear in a firewall script.