Policy Routing Using Linux®

Multiple Route Tables

Up to this point you have been using the single master route table available within Policy Routing. All of the examples and uses have assumed that you only have a single global route structure. This is true for all known Policy Routing capable devices with the exception of Linux. At this point I will diverge into the enhanced world of Policy Routing structures under Linux.

As you saw in Chapter 3, within the Linux Policy Routing structure there is provision for 255 independent routing tables. The standard structure allocation provides a default structure. Recalling this information from Chapters 3 and 4, you have the following default table structure:

 Table #253 = DEFAULT (created by the default rule #32767) Table ...