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IPv6 Datagram Encapsulation and Formatting
Delivery of data over IPv6 internetworks
is accomplished by encapsulating higher-layer data into IPv6 datagrams.
These serve the same general purpose for IPv6 as IPv4
datagrams do in the older version of the
protocol. However, they have been redesigned as part of the overall
changes represented by IPv6. IPv6 datagrams have a flexible structure
and their format better matches the needs of current IP networks.
In this section I take a look at
the format used for IPv6 datagrams. I begin with an overview of the
general structure of IPv6 datagrams, describing the major changes and
showing how main and extension headers are arranged in the datagram.
I then describe the format of the main header, and define and describe
the various extension header types. I conclude with a brief explanation
of IPv6 options and how they are implemented.
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Version 3.0 - Version Date: September 20, 2005
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Background Information: This section assumes basic understanding of