Source : Free On-Line Dictionary of Computing

Internet Protocol version 6
     
         (IPv6, IPng, IP next generation) The
        most viable candidate to replace the current {Internet
        Protocol}.  The primary purpose of IPv6 is to solve the
        problem of the shortage of {IP addresses}.
     
        The following features have been purposed: 16-byte addresses
        instead of the current four bytes; embedded {encryption} - a
        32-bit {Security Association ID} (SAID) plus a variable length
        initialisation vector in {packet} headers; user
        {authentication} (a 32-bit SAID plus variable length
        {authentication} data in headers); autoconfiguration
        (currently partly handled by {Dynamic Host Configuration
        Protocol}); support for {delay-sensitive traffic} - a 24 bit
        flow ID field in headers to denote voice or video, etc.
     
        One possible solution is based on the {TUBA} protocol (RFC
        1347, 1526, 1561) which is itself based on the {OSI}
        {Connectionless Network Protocol} (CNLP).  Another is {TP/IX}
        (RFC 1475) which changes {TCP} and {UDP} headers to give a
        64-bit {IP address}, a 32-bit {port} number, and a 64 bit
        sequence number.
     
        {RFC 1550} is a white paper on IPng.
     
        ["Doubts About IPng could create TCP/IP chaos", Johna Till
        Johnson, Data Communications, Nov 1994].
     
        (1995-04-03)