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Policy Routing Using Linux® by Matthew G. Marsh

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The Triad Elements—Address, Route, Rule

The core of Policy Routing rests on the use of three elements. These are the traditional elements of Address and Route as extended by Policy Routing, and the additional Policy Routing element: Rule. The address refers to the assigned network address under the protocol in use. The route is the corresponding directional element for the address. And the rule implements the additional information provisions demanded by Policy Routing.

These three elements comprise the structure around which the implementation of Policy Routing is built. All three play unique roles that can act singularly, but they are most effective when combined. The interactions between these elements provide the flexibility, and the complexity, ...

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