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    Part V: Scaling the IP Address Space > Chapter 19. IP Version 6

    Chapter 19. IP Version 6

    This chapter covers the following subjects:

    Global Unicast Addressing, Routing, and Subnetting: This section introduces the concepts behind unicast IPv6 addresses, IPv6 routing, and subnetting using IPv6, all in comparison to IPv4.

    IPv6 Protocols and Addressing: This section examines the most common protocols used in conjunction with IPv6.

    Configuring IPv6 Routing and Routing Protocols: This section shows how to configure IPv6 routing and routing protocols on Cisco routers.

    IPv6 Transition Options: This section explains some of the options for migrating from IPv4 to IPv6.

    IP version 6 (IPv6), the replacement protocol for IPv4, is well known for a couple of reasons. IPv6 provides the ultimate solution for the problem of running out of IPv4 addresses in the global Internet by using a 128-bit address—approximately 1038 total addresses, versus the mere (approximate) 4*109 total addresses in IPv4. However, IPv6 has been the ultimate long-term solution for over ten years, in part because the interim solutions, including Network Address Translation/Port Address Translation (NAT/PAT), have thankfully delayed the day in which we truly run out of public unicast IP addresses.


      

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