By Robert Shimonski; et al
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Additional info for Building DMZs for Enterprise networks
6 shows a basic DMZ structure. In this design, the bastion host is partially protected by the firewall. This design would potentially allow updating of Web server content from the internal network if allowed by firewall rule, which could allow traffic to and from the bastion host on specific ports as designated. 7 shows a generic dual-firewall DMZ configuration. In this arrangement, the bastion host can be protected from the outside and allowed to connect to or from the internal network. This configuration and method is more likely to be used if more than one bastion host is needed for the operations or services being provided.
Qxd 24 6/3/03 5:08 PM Page 24 Chapter 1 • DMZ Concepts, Layout, and Conceptual Design Bastion Hosts DMZ Design Fundamentals DMZ design, like security design, is always a work in progress. You will find that the time and funds spent in the design process and preparation for the implementation are very good investments if the process is focused and effective; this will lead to a high level of success and a good level of protection for the network you are protecting. In this section of the chapter, we explore the fundamentals of the design process.
DMZ Protocols Protocol use within a DMZ environment is always problematic. This table is not intended to be all-inclusive; rather, it is indicative of the fact that the DMZ designer must be aware of these limitations when designing a plan for DMZ structure and access both into and out of the DMZ.
Building DMZs for Enterprise networks by Robert Shimonski; et al