Chapter 3. Linux Policy Routing Structures
| The case for implementing Policy Routing and the related structures is easy to see. What is harder to grasp is the scope and the impact on the packet-passing paths within a TCP/IP network. The question of where and how the packets are passed from and through a network-connected device can deeply affect the points of application of Policy Routing structures. This chapter will explore the structure that allows packets to pass through a system. Most of this discussion will center on understanding the logic of the packet traversal. At times you may need to delve into the actual operation of the system innards. The overall structure of this chapter is written with an eye to generalize as much as possible to ease understanding across disparate systems. The implementation structure will be drawn from the posits and foundations of the need for Policy Routing as espoused to a large extent in Chapter 2, "Policy Routing Theory." Where possible the examples of usage for Policy Routing as arisen from the limitations of traditional routing will be referenced to clarify why particular Policy Routing structures exist. |
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