RFC4291, the type of Unicast address of IPv6

RFC4291, the type of IPv6 unicast address IPv6 address is a relatively new knowledge, many people were dizzy by the IPv6 address type when they first started learning. In addition, the update of the RFC also abolished or introduced some addresses. In the books published a few years ago, they all wrote outdated things, and I became such a master, so I wrote this article to eliminate the fallacy. The Local Address of the abolished Site is similar to the private Address in IPv4, but it may be leaked to the public network, causing some problems. So it will be abolished. Its address is now regarded as a normal global unicast address. What are the advantages of a Unique Local Address (defined in RFC 4193) that replaces the Local Address of a site? Its first 64-bit 40-bit is randomly generated and can be viewed as globally unique (240 = 1,099,511,627,776, greater than 100 billion ). In case of a route leak, it will avoid conflicts with public routes. The Unspecified Address IPv4 uses 0.0.0.0 as The Unspecified Address. In IPv6, The corresponding Address is:, that is, 0: 0: 0: 0: 0: 0: 0: 0: 0: 0. Www.2cto.com The Loopback Address IPv4 uses 127.0.0.1 as The Loopback Address. The corresponding IPv6 Address is: 1, that is, 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 1. The public IP address in Global Unicast Addresses IPv6. Currently, only addresses starting with 2 and 3 (hexadecimal) are allocated. The number is 2125 = 4.253529586511731 × 1037, in contrast, there are only 4.294967296 × 109 IPv4 addresses in total. Link-Local IPv6 Unicast Addresses can be seen as a special case of global Unicast Addresses. Its flood range can only be links between Local nodes, that is, Local connections are valid. This address is automatically assigned to each interface of the node after the IPv6 protocol is run. IPv6 Addresses with Embedded IPv4 Addresses (IPv6 Addresses with Embedded IPv4 Addresses)
In a sense, this address is not a heavyweight address. This type of address is used for the transition from an IPv4 address to an IPv6 address for several years. In addition, different transition mechanisms may have different built-in IPv4 representation methods. Which of the following types of transition mechanisms are used? The answer may be provided at the first v4/v6 international testing conference held by Beijing University of Posts and Telecommunications in November this year. Http://tools.ietf.org/html/rfc4291 http://tools.ietf.org/html/rfc4193 author zmx009