IPv6

IPv6 is stand for "Internet Protocol version 6". It is designed to replace IPv4 which is used for over twenty years. IPv4 will become a problem when IPv4 cannot supply enough IP address for every person arround the world. With 128 bit address, IPv6 will supply more enough ip address for every people around the world. Beside the increment of number of address number, IPv6 also added another improvement to IPv4 like routing and network autoconfiguration. So maybe in this few year there will be a lot of application that apply IPv6.

There are a lot features from IPv6, below is the features from IPv6: (www.wikipedia.com)
-Larger Address Space
IPv6 provide more address than IPv4. It provides 128 bit addresses than IPv4 32 bit addresses

-Stateless autoconfiguration of hosts
IPv6 hosts can be configured automatically when connected to a routed IPv6 network. When first connected to a network, a host sends a link-local multicast (broadcast) request for its configuration parameters; if configured suitably, routers respond to such a request with a router advertisement packet that contains network-layer configuration parameters.
If IPv6 autoconfiguration is not suitable, a host can use stateful autoconfiguration (DHCPv6) or be configured manually.
Stateless autoconfiguration is only suitable for hosts: routers must be configured manually or by other means.

-Multicast
Multicast is the base of IPv6, where in IPv4 it is optional.

-Jumbograms
In IPv4, packets are limited to 64 KiB, but in IPv6 the packets can be as large as 4 GiB

-Network-Layer Security
IPsec, the protocol for IP network-layer encryption and authentication, is an integral part of the base protocol suite in IPv6; this is unlike IPv4, where it is optional (but usually implemented). IPsec, however, is not widely deployed except for securing traffic between IPv6 BGP routers.

-Mobility
Unlike mobile IPv4, Mobile IPv6 (MIPv6) avoids triangular routing and is therefore as efficient as normal IPv6. This advantage is mostly hypothetical, as neither MIP nor MIPv6 are widely deployed today.