IPv6 is beginning to be adopted by organizations and countries that expect to run critically short of IPv4 addresses Small scale trials can rely on dual-stack transition mechanisms, in which both an IPv4 and an IPv6 address are assigned to new hosts, which can therefore talk directly to old and new networks. But full deployment will need to use network address/port/protocol translation (NAPT-PT), in which new hosts are given only IPv6 addresses and must talk through a gateway in order to speak to old networks. The natural location for these NAPT-PT gateways will gradually shift from very local subnets to the edge of a provider network as IPv6 becomes more widely deployed, increasing the demands on the capacity and availability.
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