What is ipv4 ipv6 ipv9 What is the difference between the

Since the access to the Windows 7 operating system, some of the network connections inside, what ipv4 and ipv6, etc., most of the beginning do not understand what it means, today just some users asked the author What is ipv4, ipv6, and ipv9? Around this question, the author also looked for a lot of information before, only to understand what is going on? Here, the author has compiled and reviewed it with everyone.

In the front, ipv4 and ipv6 are the protocol families used by the current global Internet. The TCP/IP protocol, that is, the number of IPv4 address bits is 32 bits, that is, the maximum number of 32 powers is 32. The computer can be connected to the Internet at the same time. Due to the booming development of the Internet for more than a decade, the demand for IP addresses has become larger and larger, making the distribution of IP addresses more stringent. Various data indicate that the global IPv4 address may be All will be issued in 2010. While ipv6 uses a 128-bit address length, it can provide an address almost unrestricted. The IPv6 actually assignable address is estimated in a conservative way, and more than 1000 addresses can be allocated per square meter of the entire earth. In the design process of IPv6, in addition to solving the address shortage problem once and for all, it also considers other problems that are not well solved in IPv4, mainly end-to-end IP connection, quality of service (QoS), security, multicast, mobile Sex, plug and play, etc., 2011 is a key year for the development of IPv6 and the Internet. The last batch of IPv4 addresses in the world has been allocated, and the transition from the Internet to IPv6 has begun to enter the implementation phase. Let's talk about ipv9, the IPv9 technology (or called the decimal network) that used to maintain China's network sovereignty a few years ago is now silent. The inventor Xie Jianping, the decimal network standard working group and its academic team have always been " Commercial secrets, refusing to disclose technical details about IPv9, recently ipv9 has appeared some domestic friends, saying what ipv9, simple can be understood, the biggest feature of IPv9 is the use of decimal numbers for URL encoding, The best computer configuration network. This means that users can enter a simple digital domain name such as "12345" to replace a domain name like "www.abc.com". What are the characteristics and advantages of IPv6 compared to IPv4?

IPv6 has a larger address space. In IPv4, the IP address length is 32, that is, there are 2^32-1 addresses; and the length of the IP address in IPv6 is 128, that is, there are 2^128-1 addresses. And with a smaller routing table, IPv6 address allocation follows the principle of aggregation (Aggregation), which enables the router to use a record (Entry) in the routing table to represent a subnet, greatly reducing the routing in the router. The length of the table increases the speed at which the router forwards packets. Enhanced multicast support and flow-control support. This has enabled the development of multimedia applications on the network to provide a good network platform for quality of service (QoS) control. It has added support for Auto-configuration. This is an improvement and extension of the DHCP protocol, which makes the management of the network (especially the local area network) more convenient and faster. Higher security. In the IPv6 network, users can encrypt the data of the network layer and perform IP packets. Verification, which greatly enhances network security. Finally, a simple look at China's own ipv9, there are many problems. It is reported that the three major domestic operators have begun to promote the development of IPv6. Duan Xiaodong, deputy director of the Network Technology Research Institute of China Mobile Communications Research Institute, said on the 8th that it is recommended to force IPv6 to be supported when devices and terminals access the network. This is consistent with the previous view that China Mobile said that “mobile terminals are not satisfactory for IPv6 support and that they need urgent support for the logo”. Zeng Gaofei said that from the perspective of China Mobile, the “marking” is still on the paper stage, or underground, and has not been officially announced, let alone approved. For mobile TD terminals, there are still no commercial and IPv6-enabled terminals, and there are still big gaps in chip development. Zeng Gaofei said that China Mobile’s idea is very simple, requiring terminal enterprises to implement the use of technology and to put technology from foreign companies. And the accessories are taken back and placed in the terminal. This is how fast and good. However, it will add a large cost to the terminal. In this way, Chinese enterprises are still hollowed out in this technology, and they still cannot escape the technical path of being human. Because the terminal will increase the cost, mobile phone manufacturers are not willing to develop related TD terminals supporting IPv6 for China Mobile. “This should be one of the reasons”, the other two reasons are whether other terminal accessories are compatible with IPv6, and whether the actual use of IPv6 has a market. “China Mobile has to invest a lot of money to promote”, it is difficult for enterprises to obtain high profits on the terminal. Therefore, it is also a problem for companies to lack the motivation to fund and thus not to help China Mobile.