Chapter 5. Simple Network Examples
| This chapter will take you through a series of implementation examples for Policy Routing. These examples primarily draw upon the use and configuration of Policy Routing under Linux. You will see the various uses of the ip utility, which was illustrated in Chapter 4. In some instances I will use and refer to other utilities and methods for configuring the structure, but will not be explaining those utilities in this book. This chapter starts off with the Policy Routing core subjects of addresses, routes, and rules. As you saw in Chapter 3, "Linux Policy Routing Structures" these subjects comprise the core of the RPDB. In most cases I start with the overall theory and delve deeper into the ramifications of implementing that theory. Interspersed throughout are practical examples intended to reinforce the theory and usage. The examples create an ever-increasing complexity and illustrate many of the concepts of Policy Routing. You will see how the limitations of the protocols come into play especially when considering implementations within a finite network structure. After covering the fundamentals of addressing, routes, and rules, you will jump into the interactions and manipulation of multiple routing tables. This covers the more esoteric structures using tables with some simple rule structures. Then all of the basics are applied to illustrate the complex interactions that can be created with simple steps. In this scenario you will explore the full gamut of addressing, routes, and rules all multiply interacting. At the end of this chapter you will have full control of the basics, a black belt of Policy Routing in Linux. |
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