O'Reilly logo

Policy Routing Using Linux® by Matthew G. Marsh

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

RPDB—The Linux Policy Routing Implementation

Under Linux, the implementation of Policy Routing structure is carried out through the mechanism of the Routing Policy DataBase (RPDB). The RPDB is the cohesive set of routes, route tables, and rules. Since addressing is a direct function of these elements, it also is part of the system. What the RPDB primarily does is provide the internal structure and mechanism for implementing the rule element of Policy Routing. It also provides the multiple routing tables available under Linux.

Linux with the RPDB and the complete rewrite of the IP addressing and routing structures in kernel 2.1 and higher sustains 255 routing tables, and 2^32 rules. That is one rule per IP address under IPv4. In other words, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required