What are the differences between IPv6 and IPv4?

IPv6 is the next-generation IP protocol designed by IETF to replace the current version of the IP protocol IPv4. Due to the limited network address resources of IPv4, IPv6 emerged as a result of the rapid development of the Internet.

There are many differences between IPv6 and IPv4. Currently, we use the second generation Internet IPv4 technology. The core technology belongs to the United States. Its biggest problem is that network address resources are limited. Theoretically, there are 4.3 billion IP addresses available for IPv4 technology, of which 3/4 and 3 billion are available in North America, the largest population in Asia is less than 0.4 billion, and China is more than, which is equivalent to the number of Massachusetts Institute of Technology in the United States. Insufficient addresses severely restrict the application and development of the Internet in China and other countries.

Compared with IPv4, IPv6 has the following advantages: first, the network address is almost infinite. According to this technology, the network address can reach the power of 2, if the total number of IPv4 addresses is a small bucket of sand, the total number of IPv6 addresses is like a bucket of sand as big as the Earth. The second reason is that because everyone can have more than one IP address, the security performance of the network will be greatly improved. Third, the data transmission speed will be greatly improved. The main advantages of IPv6 compared with IPv4 are as follows: improving the overall network throughput, improving service quality (QoS), supporting plug-and-play and mobility, and better implementing multicast functions. According to this technology, if IPv4 only implements man-machine conversation, while IPv6 expands to the dialogue between anything, it can not only serve humans, but also serve many hardware devices, such as household appliances, sensors, remote cameras, and automobiles, it will be a real broadband network that is everywhere in every corner of the society. The economic benefits it brings will be enormous. Of course, IPv6 is not perfect and cannot solve all problems once and for all. IPv6 can only be continuously improved in development, nor can it occur overnight. The transition takes time and cost. However, in the long run, IPv6 is conducive to the sustained and long-term development of the Internet. At present, Internet organizations have decided to set up two specialized working groups to develop corresponding international standards.

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

1) Larger address space. In IPv4, the IP address length is 32, that is, 2 ^ 32-1 addresses; in IPv6, the IP address length is 128, that is, 2 ^-1 addresses.

2) Smaller route tables. IPv6 Address Allocation follows the Aggregation principle from the beginning, which enables the router to express a subnet with an Entry in the route table, greatly reducing the length of the route table in the router, this improves the speed of router packet forwarding.

3) Enhanced Multicast support and Flow-control support ). This gives multimedia applications on the network a great opportunity to develop and provides a good network platform for QoS control.

4) added support for Auto-configuration. This is an improvement and expansion of the DHCP protocol, making the management of networks (especially Local Area Networks) more convenient and convenient.

5) higher security: in IPv6 networks, users can encrypt network layer data and verify IP packets, which greatly enhances network security.