H3C Technologies H3C SecPath F1000-E - Manual (Page 101)

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IPv6 Basics Configuration
This chapter includes these sections:
• IPv6 Overview
• IPv6 Basics Configuration Task List
• Displaying and Maintaining IPv6 Basics Configuration
• IPv6 Configuration Example
• Troubleshooting IPv6 Basics Configuration
IPv6 Overview
Internet Protocol Version 6 (IPv6), also called IP next generation (IPng), was designed by the Internet
Engineering Task Force (IETF) as the successor to Internet Protocol version 4 (IPv4). The significant
difference between IPv6 and IPv4 is that IPv6 increases the IP address size from 32 bits to 128 bits. This
section covers the following:
• IPv6 Features
• IPv6 Addresses
• IPv6 Neighbor Discovery Protocol
• IPv6 PMTU Discovery
• IPv6 Transition Technologies
• Protocols and Standards
IPv6 Features
Header format simplification
IPv6 cuts several IPv4 header fields or move them to the IPv6 extension headers to reduce the length of
the basic IPv6 packet header. The basic IPv6 packet header has a fixed length of 40 bytes to simplify
IPv6 packet handling and to improve the forwarding efficiency. Although an IPv6 address size is four
times larger than an IPv4 address, the basic IPv6 packet header size is only twice the size of the
option-less IPv4 packet header.