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1.1 1.1 1.1.4 Simplified Header Structures IPv6 has simpler packet header structures than IPv4. It will allow vendors to implement hardware acceleration for IPv6 routers easier. 1.1.5 Allows Flexible Protocol Extensions IPv6 allows more flexible protocol extensions than IPv4 by introducing a protocol header chain. Even though IPv6 allows flexible protocol extensions, IPv6 does not impose overhead to intermediate routers. It is achieved by splitting headers into two flavors: the headers intermediate routers need to examine and the headers the final destination will examine. This also eases hardware acceleration for IPv6 routers. 1.1.6 Smooth Transition from IPv4 There were a number of transition considerations made during the IPv6 discussions. Also, there is a large number of transition mechanisms available. You can pick the most suitable one for your network during the transition period. 1.1.7 Follows the Key Design Principles of IPv4 IPv4 was a very successful design, as proven by the large-scale global deployment. IPv6 is a new version of IP, and it follows many of the design features that made IPv4 very successful. This will also allow smooth transition from IPv4 to IPv6. 1.1.8 And More There are number of good books available about IPv6. Be sure to check these if you are interested. Protocol Header Chain IPv6 defines a protocol header chain, which is a way to concatenate extension headers repeatedly after the IPv6 base header. With IPv4, the IPv4 header is adjacent to the final header (like TCP). With IPv6, the protocol header chain allows various extension headers to be put between the IPv6 base header and the final header. IPv6 header Routing header Fragment header Fragment of TCP Next Header = Routing Next Header = Fragment Next Header = TCP header + data Chapter
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