Much of what this chapter discusses is valid regardless of whether you are using IPv4 or IPv6. We start here with a short description of each to lay a foundation for further understanding. As IPv6 receives greater acceptance and use, this understanding should be adequate to help you transition between the two, even if specific issues are not addressed in the chapter. If you missed the “Limits of IPv4 Addressing” note in the earlier “TCP/IP Addressing” section, you should go back and read through it to get started.
IPv4 is based on 32-bit numbering and limits the number of available IP addresses to about 4.1 billion. This and how those addresses were assigned has led to the realization that there are not enough IPv4 addresses available ...
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