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Policy Routing Using Linux® by Matthew G. Marsh

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IP Addressing

The first and most basic of the Policy Routing structure elements is the addressing structure. This fundamental part of an IP network is often completely taken for granted. In the many sessions I have given on using Policy Routing in Linux, I am always asked why I even bother discussing addresses. In reply, I usually ask if anybody there can explain what an IP address is. With your own answer to this question in mind, let me begin.

When looking at a Policy Routing setup you should start by considering the IP addressing structure. The use and interactions of addressing in an IPv4 network often indicate the fundamental data flow of the network structure. To fully understand how these addresses interact with the routing structure ...

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