6.3. Configuring PIX
You can use PIX in any of the three primary firewall configurations: bastion, three-way, or back-to-back. The basic models (like the one we're demonstrating) work with only two interfaces: inside and outside. Typically, however, you use PIX in a three-way firewall, acting as the central control point between the external network, the DMZ (De-Militarised Zone), and the internal network. In other words, all network traffic between the external network and your DMZ and internal networks flows through, and is subject to, the firewall.
PIX is preconfigured with two interfaces that are simply referred to as inside and outside. PIX uses security levels to determine how filtering rules are applied to the interfaces. (You can define ...
Get Mastering™ Network Security, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
