IPv6
http://en.wikipedia.org/wiki/IPv6
http://pt.wikipedia.org/wiki/IPv6
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Comcast sees end of IPv4 tunnel, beginning IPv6 trial
IPv4 Addresses Running Out; Where is IPv6?
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What happens when IPv4 addresses run out?
The simple answer is: not a lot. The Internet will continue to function mostly as it does before; you’ll still be able to browse new sites, and so on. However, what will happen is that no new businesses can start up on the net, at least, without multi-hosting on an existing IP address. In short, it could be a slowdown in the Internet economy that has ballooned over the last decade.
There are those who claim that NAT will solve the shortage at the client side (which hides a set of non-routable addresses behind a signle globally routable IP address) - but even this has limits. Assuming each computer is actively connecting to around 25 outgoing ports simultaneously (not a difficult number to achieve with a few web pages open, the odd mail client and social networking application), combined with the fact that most NAT-level routers can only handle mappings for up to 50,000 ports at a time, means that at best, a globally routable IPv4 address can only field another 50k items.
Furthermore, NAT can’t be used for servers or other websites which need to be connected; they can only be applied on the client connecting in side. Regardless of whether this solves the problem of an ever growing list of clients, once the IPv4 addresses run out there can be no new servers.
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Este assunto está a ser discutido no bandalarga.org em “IPv6“.