After reading this chapter, you should be able to explain the rationale behind IPv6 and should have a basic understanding of the main features and benefits provided by IPv6. In addition, you should remember the following information:
Studies predict an exhaustion of the current IPv4 address space between 2005 and 2011.
The IPv4 address space is limited by its 32-bit address scheme. Moreover, large portions of the space are already allocated, and other parts are unavailable as globally unicast addresses.
As the Internet continues to grow, more IPv4 addresses are requested for new devices and applications.
The combination of CIDR and NAT mechanisms has helped slow down the exhaustion of the address space. However, NAT breaks the end-to-end ...