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, ...
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