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 ...
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