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For questions about Internet Protocol version 6 (IPv6); as specified in RFC2460.

Internet Protocol version 6 (IPv6) is a new version of the Internet Protocol, designed as the successor to Internet Protocol version 4 (IPv4). The changes from IPv4 to IPv6 fall primarily into the following categories:

o  Expanded Addressing Capabilities

    IPv6 increases the IP address size from 32 bits to 128 bits, to
    support more levels of addressing hierarchy, a much greater
    number of addressable nodes, and simpler auto-configuration of
    addresses.  The scalability of multicast routing is improved by
    adding a "scope" field to multicast addresses.  And a new type
    of address called an "anycast address" is defined, used to send
    a packet to any one of a group of nodes.

o  Header Format Simplification

    Some IPv4 header fields have been dropped or made optional, to
    reduce the common-case processing cost of packet handling and
    to limit the bandwidth cost of the IPv6 header.

 o  Improved Support for Extensions and Options

    Changes in the way IP header options are encoded allows for
    more efficient forwarding, less stringent limits on the length
    of options, and greater flexibility for introducing new options
    in the future.

o  Flow Labeling Capability

    A new capability is added to enable the labeling of packets
    belonging to particular traffic "flows" for which the sender
    requests special handling, such as non-default quality of
    service or "real-time" service.

o  Authentication and Privacy Capabilities

   Extensions to support authentication, data integrity, and
   (optional) data confidentiality are specified for IPv6.
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