Chapter 8. Locator-Identifier Separation

Chapter 2 discussed the Internet protocol stack and in particular the fact that the IP address functions simultaneously as a Routing Locator (which is an identifier with a topological meaning) and as an Endpoint Identifier. Figure 8-1 illustrates this dual role. In retrospect, this can be seen as a design mistake, especially in the light of mobility.

Figure 8-1. Layers of the Internet Architecture


When a host changes its point of attachment to the Internet, its IP address must change as well, and therefore all transport sessions will break. The previous chapters took the design of the Internet stack as ...

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