Chapter 8. NAT Functions
| Dealing with the vagaries of routing structures using a dynamic routing protocol is very helpful. But it is limited in usefulness when you consider the current structure of the IPv4 Internet. Within the boundaries of a corporate network, routing is defined and scoped. Many of the routing tricks such as asymmetric, or loopy, routing, and the related structures take on a whole new meaning when applied to the border and outside of a corporate network. While the examples you saw in Chapters 5, "Simple Network Examples" and 6, "Complex Network Examples" about border area Policy Routing work well when you consider the entire scope of the addressing space, what about cases where there is address translation? These cases of Network Address Translation, or NAT, are what you will explore in this chapter. You will start by considering the definitions of NAT both from the technical and popular viewpoints. Then you will try out some of the various uses of NAT. Finally, you will explore the interactions between the firewalling functions and the Policy Routing structures. |
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