Interactions Between FastNAT and NetFilter
This consideration brings you to the question of the interactions between the FastNAT and the NetFilter NAT. From your studies on the packet pathing in Chapter 3, "Linux Policy Routing Structures," you assume that you could have FastNAT and NetFilter too. After all, FastNAT is implemented within the RPDB while NetFilter NAT is implemented at the PRE and POST ROUTING hook points.
Such a view does not consider the reality of the kernel packet processing functions. While ideally this would be a perfect complementary function set, the reality is that there are only a few places where the packet header may be manipulated by either system. In testing the various functions you note that so long as you do not ...
Get Policy Routing Using Linux® now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
