Chapter 6. Configuring Transparent Firewalls
Cisco IOS Release 12.3(7)T introduced the transparent firewall feature: the ability to filter IP traffic between a pair of bridged interfaces. This feature is fully supported by the new zone-based configuration commands, making transparent firewall configuration extremely simple. Before configuring this interesting feature (which introduces no additional configuration commands), you have to understand its underlying mechanisms and design rules, which we cover in depth in this chapter. Throughout most of the examples, we focus on a slightly modified version ...
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