IPv6 knowledge point Overview

Overview of various IPv6 knowledge points * Introduction of IPv6-IPv4 has been running well and stably-Is IPv4 perfect? -- Next-generation Internet Protocol --- IPv6 -- the biggest feature is that the address length increases from 32 bits to 128 bits * IPv6 features -- IPv4 deficiency * The biggest problem is that available addresses are increasingly lacking * for terminals for users, configuration is not simple enough * lack of security and QoS support-advantages of IPv6 * almost unlimited address space, 3.4*10 ^ 38 addresses * end users do not need to configure any * designed to consider enhanced security and QoS * IPv6 address representation-colon hexadecimal notation * 16-bit segments, 8 segments in total-to shorten the writing length, you can use compression to indicate that the leading "0" compression * Full "0" segments in the * segment are compressed-for example, full address --> 2001: 0410: 0000: 0001: 0000: 0000: 0000: 45FF first step Compression --> 2001: 410: 0: 1: 0: 0: 0: 45FF second part compression --> 2001: 410: 0: 1: 45FF * IPv6 address composition -- IPv4 address composition -- IPv6 address composition * No class concept * comparison of IPv6 and IPv4 packet formats * IPv6 uses: -- Unicast * one-to-one * is similar to IPv4 Unicast address -- Multicast * one-to-many * large enough address space -- Anycast * allocates one or more * from the Unicast address space, use unicast address format * Common IPv6 address types and formats