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TCP/IP Guide by Charles M. Kozierok

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IPsec Security Constructs

Important IPsec security constructs include security associations, the security association database, security policies, the security policy database, selectors, and the security parameter index. These items are all closely related and essential to understand before you begin looking at the core IPsec protocols. These constructs are used to guide the operation of IPsec in a general way and particularly to guide exchanges between devices. The constructs control how IPsec works and ensure that each datagram coming into or leaving an IPsec-capable device is treated properly.

Security Policies, Security Associations, and Associated Databases

Let's begin by considering the problem of how to apply security in a device that may ...

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