The availability of an almost unlimited number of IP addresses is the most compelling benefit of implementing IPv6 networks. Compared to IPv4, IPv6 increases the number of address bits by a factor of 4, from 32 bits to 128 bits. The 128 bits provide approximately 3.4x1038 addressable nodes, enough to allocate about 1030 addresses per person on this planet. Figure 1 shows the general format of an IPv6 address.
Figure 1: IPv6 Address Format
The ability to provide a unique address for each network device enables end-to-end reachability, which is especially important for residential IP telephony. IPv6 also provides full support for application protocols without requiring special processing at the edges of the networks, eliminating the problems associated with NAT.
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