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Not a problem. In all honesty it's the same reason IPv6 is replacing IPv4. We ran out of IP addresses. With the 128-bit structure of IPv6, we literally have enough addresses for each person on the world to have trillions of them for themselves. (340,282,366,920,938,463,463,374,607,431,768,211,456 total addresses, Estimating 6,840,507,000 people in the world, and we can determine that there is approximately 4.97451968 × 1028 addresses PER PERSON.) All of this leaves us to wonder, what will we do with that many addresses? The address space is divided into two sections, similar to IPv4. There is a network portion, the first 64 bits, and a host portion, the last 64 bits. (We have already seen that this is 18,446,744,073,709,551,616 for each section.) Now, using this information we are dividing the 64-bit network portion up even further, with a 32-bit section at the front being allocated to local Internet Registries. They allocate a /32 (32-bit network header) block to an ISP. Then RFC 6177 recommends the distribution of that into a /56 for each end-user site. (I.e. 256 networks into each site, replaced RFC 3177 recommending /48 for each site, thus allowing for more end users for each /32 block.) This leaves each /32 block with 16,777,216 /56 sites. (I.e. Each /32 block can have 16,777,216 end users.) The only problem now is transitioning to IPv6, which is a much larger task than most people thought. (Considering the hundreds of thousands if not millions of routers and switches in the world, that all have to transition, this is going to be interesting.) There are actually multiple methods to make the transition implementation easier. Including some IPv6 tunneling standards, to wrap an IPv6 network through an IPv4 network. (Although we are still in the process of getting it distributed throughout the world.) For the most part, China and the American D.o.D. are the only places fully converged. (That I know of at least.) Thanks, EBrown