3 Internet Protocol Version 6
3.1 Introduction
The basic operational principles are not different between IPv4 and IPv6. From operational experiences of IPv4, however, IPv6 introduces some remarkable changes. One major revision is the introduction of extension headers. Unlike the IPv4 options, each extension header is realized as if it were a separate upper layer protocol, thereby enlarging the possible number and size of options.
Other types of optional information are also implemented using the framework of extension headers. For example, packet fragmentation and source routing are implemented with dedicated extension headers. As a result of the introduction of extension headers, the base IPv6 header has been simplified and only contains ...
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