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This article mainly explains "what's the difference between ipv4 ipv6 ipv9". Interested friends might as well take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what's the difference between ipv4 ipv6 ipv9"?

Since I came into contact with the windows 7 operating system, most of the network connections, such as ipv4 and ipv6, are not clear at first. Today, some netizens happened to ask the author what is ipv4, ipv6, and ipv9? Around this problem, the author also looked up a lot of information before to understand what is going on. Here the author has sorted out and reviewed it with you.

Written above, ipv4 and ipv6 are the current protocol family adopted by the global Internet is the TCP/IP protocol, that is, the number of IPv4 addresses is 32 bits, that is, computers with a maximum number of 2 to the 32 powers can be connected to Internet at the same time. For more than a decade, due to the vigorous development of the Internet, the demand for IP addresses is increasing, which makes the issuance of IP addresses more stringent. All data show that the global IPv4 addresses may be completed in 2010. Ipv6, on the other hand, uses a 128-bit address length and can provide addresses almost without restriction. According to the conservative method to estimate the actual addresses that can be allocated by IPv6, more than 1000 addresses can still be allocated per square meter of the whole earth. In the design process of IPv6, in addition to solving the problem of address shortage once and for all, other problems that can not be solved well in IPv4 are also considered, such as end-to-end IP connection, quality of service (QoS), security, multicast, mobility, plug and play and so on. 2011 is a key year for the development of IPv6 and the Internet. The last batch of IPv4 addresses in the world have been assigned, and the transition from Internet to IPv6 has begun to enter the implementation stage.

Let's talk about ipv9. A few years ago, the IPv9 technology (or decimal network), which was used to safeguard China's network sovereignty, has been silent. At that time, its inventor Xie Jianping, the working group on decimal network standards and their academic team have all along refused to disclose the technical details about IPv9 on the grounds of "trade secrets." recently, ipv9 has been sought after by some domestic friends, saying what is ipv9. It can be understood in this way. The biggest feature of IPv9 is the use of decimal numbers for URL coding, the best computer configuration network. In other words, users can enter simple numeric domain names such as "12345" to replace domain names such as "www.abc.com".

What are the characteristics and advantages of IPv6 compared with IPv4?

IPv6 has more address space. IPv4 specifies that the length of IP address is 32, that is, there are 2 ^ 32-1 addresses, while the length of IP address in IPv6 is 128, that is, 2 ^ 128-1 address. And has a smaller routing table, the address allocation of IPv6 follows the principle of Aggregation from the very beginning, which enables the router to represent a subnet with an Entry in the routing table, which greatly reduces the length of the routing table in the router and improves the speed at which the router forwards packets. Enhanced Multicast (Multicast) support and convection support (Flow-control). This makes the multimedia application on the network have a great opportunity to develop, and provides a good network platform for QoS control. Added support for automatic configuration (Auto-configuration). This is an improvement and extension of DHCP protocol, which makes the management of network (especially local area network) more convenient and fast. Higher security. In the IPv6 network, users can encrypt the data of the network layer and check the IP message, which greatly enhances the network security.

Finally, let's take a brief look at China's self-created 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 Institute of Network Technology of China Mobile Research Institute, said on the 8th that it is recommended that devices and terminals be required to support IPv6 when entering the network. This is consistent with the view that some people in China Mobile have previously said that "the support of mobile terminals for IPv6 is not satisfactory and urgent support is needed."

Zeng Gaofei said that from China Mobile's position, the "line mark" is still in the stage of talking on paper, or underground, and has not yet been officially announced, let alone recognized.

As for the mobile TD terminal, there is still no commercial terminal that supports IPv6, and there is also a big gap in chip development. Zeng Gaofei said that China Mobile's idea is very simple, requiring terminal enterprises to implement borrowlism, take technology and accessories back from foreign enterprises and put them in the terminal. This is the way to save time and speed. However, it will add a lot of cost to the terminal.

In this way, Chinese enterprises are hollowed out in this area of technology, and it is still difficult to escape the old road of being controlled by others in technology. Because terminals will increase costs, mobile phone manufacturers are reluctant to develop IPv6-enabled TD terminals for China Mobile. "this should be one of the reasons." the other two reasons are whether other terminal accessories are matched with IPv6, and whether there is a market for the actual use of IPv6. "China Mobile has to invest a lot of money to promote it," and it has been difficult for enterprises to make high profits on terminals. Therefore, it is also a problem that enterprises are unwilling to help China Mobile because of the lack of financial incentive.

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