What is the difference between Ipv6:ipv4 and IPv6

IPV6 is the abbreviation for "Internet Protocol version 6", which is the next generation IP protocol designed by the IETF to replace the current version of the IP protocol-ipv4-.

At present we use second-generation Internet IPV4 technology, the core technology belongs to the United States. Its biggest problem is that the network address resources are limited, theoretically, IPV4 technology can use 4.3 billion of IP addresses, of which North America occupies 3/4, about 3 billion, while the largest population of Asia, only less than 400 million, China only 3千多万个, equivalent to the number of MIT in the United States. The lack of address severely restricts the application and development of Internet in China and other countries.

Compared with IPV4, IPV6 has the following advantages: The first is the network address almost unlimited, according to this technology, its network address can reach 2 128 times, if IPV4 address totals for a small bucket of sand, then the total number of IPV6 address is like the earth that big bucket of sand. The second is that because everyone can have more than one IP address, the security performance of the network will be greatly improved. The third is the speed of data transmission will be greatly improved. The main advantages of IPV6 are as follows: improving the overall throughput of the network, improving quality of service (QoS), supporting Plug and Play and mobility, and better implementation of multicast capabilities. According to this technique, if the IPV4 realizes only the man-machine conversation, but the IPV6 expands to the dialogue between the thing, it may not only serve for the human, but also will serve the multitudinous hardware equipment, like home appliances, the sensor, the long-distance camera, the automobile and so on, it will be all the time, Everywhere in the deep society every corner of the real broadband network. And the economic benefits it brings will be huge. Of course, IPV6 is not perfect, once and for all, it is impossible to solve all problems. IPV6 only in the development of continuous improvement, and can not happen overnight, the transition takes time and cost, but in the long run, IPv6 is conducive to the sustainable development of the Internet and long-term. At present, the Internet organization has decided to set up two specialized working groups to develop corresponding international standards.

IPv6 FAQ

1. What is IP? What is IPV4? What is IPV6?

The protocol family used in the current global Internet is the TCP/IP protocol family. IP is the protocol of Network layer in TCP/IP protocol family, and it is the core protocol of TCP/IP protocol family. The current version number for the IP protocol is 4 (IPV4), and its next version is IPV6. IPV6 is in the process of continuous development and improvement, it will replace the IPV4 which is widely used in the near future.

2. What are the characteristics and advantages of IPv6 compared to IPv4?

1 Larger address space. IPV4 IP Address length of 32, that is, 2^32-1 address, and IPV6 IP address length of 128, that is, 2^128-1 address.

2 smaller routing table. IPv6 address assignment from the beginning to follow the principle of Clustering (Aggregation), which enables routers to use a record in the routing table (Entry) to represent a film network, greatly reducing the length of the router's middle table, improve the router forwarding packet speed.

3 Enhanced Multicast (multicast) Support and convection support (Flow-control). This makes the multimedia applications on the network have a great development opportunity, and provides a good network platform for QoS control.

4 added support for automatic configuration (auto-configuration). This is the improvement and extension of DHCP protocol, which makes the management of network (especially LAN) more convenient and quicker.

5 higher security. In the use of IPV6 network, users can encrypt the network layer data and verify the IP message, which greatly enhances the security of the network.

3. Do we need to 2^128-1 an IP address?

Need. With the development of electronic technology and network technology, the computer network will enter People's daily life, everything around us may need to connect to the global Internet. And, to be exact, using IPV6 's network does not 2^128-1 a fully exploited address. First, to implement automatic IP address configuration, The subnet used by the LAN must have a prefix equal to 64, but few have a LAN to hold 2^64 network terminals; Secondly, because the IPV6 address assignment must follow the clustering principle, the address waste is unavoidable.