Julie188 writes "The sales pitch was that IPv6, with its zillions of new IP addresses, would eliminate the need for network address translation altogether. But Jeff Doyle, one of the guys who literally wrote the book on IPv6, suggests that not only will NAT be needed, but it will be needed to save IPv4 at the tipping point of IPv6 adoption. 'I've written previously that as we make the slow — and long overdue — transition from IPv4 to IPv6, we will soon be stuck with an awkward interim period in which the only new globally routable addresses we can get are IPv6, but most public content we want to reach is still IPv4. Large Scale NAT (LSN, also known as Carrier Grade NAT or CGN) is an essential tool for stretching a service provider's public IPv4 address space during this transitional period.'"
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