IPv6 in action, what is the practical use of IPv6

The biggest problem of IPv4 is the lack of network address resources, which seriously restricts the application and development of the Internet. The use of IPv6 can not only solve the problem of the number of network address resources, but also solve the obstacle of multiple access devices to connect to the Internet.

While IPv6 is still in the research phase around the world, many technical issues need to be further addressed, and the number of devices that support IPv6 is very limited. Overall, however, the global development of IPv6 technology is ongoing, and as IPv4 is exhausted, many countries have realized the benefits of IPv6 technology.

In particular, China has promoted the full deployment and large-scale commercial use of IPv6 next-generation Internet through some national-level projects. As the IPv6 technology becomes more and more perfect, its high cost, slow development, and insufficient support will soon fade out of the field of vision.

IPv4 specifies that the length of an IP address is 32, and the maximum number of addresses is 2 32In IPv6, the length of an IP address is 128, that is, the maximum number of addresses is 2 128. Compared to the 32-bit address space, its address space has increased by 2 128-2 32.

IPv6 uses smaller routing tables. IPv6 address allocation follows the principle of aggregation at the beginning, which allows the router to use a record (entry) in the routing table to represent a ** network, which greatly reduces the length of the routing table in the router and improves the speed of the router's ** packet.

IPv6 adds enhanced multicast support and flow control, which gives the network an opportunity for multi-class applications to develop rapidly, providing a good network platform for quality of service (QoS) control.

Refer to the above content: Encyclopedia-IPv6

In short, IPv6 in addition to the abundant number of IP addresses, IPv6 has many other advantages over IPv4, with faster transmission speed, fast, faster, very fast, this is now the long-term pursuit of the Internet, and IPv6 is a fixed header, not like IPv4 carries a bunch of lengthy data, short header to improve the efficiency of network data.

And because the IPv6 routing table is smaller and the aggregation capacity is stronger, the path of data is shorter, which greatly improves the efficiency.

Currently, there are three strategies and transition technologies to achieve the coexistence of IPv4 and IPv6.

First, use dual stack to allow your host or network device to support both IPv4 and IPv6 dual stacks. Second, IPv6 packets are encapsulated in IPv4 packets through tunneling technology. Third, IPv6 packets are converted into IPv4 packets and vice versa via Network Address Translation (NAT) technology.

Dual-stack technology is an effective technology for the transition from IPv4 to IPv6, and its nodes support both IPv4 and IPv6 protocol stacks, and use IPv6 protocol stacks when IPv6 nodes communicate with IPv6 nodes, and use IPv4 protocol stacks with IPv4overIPv6 tunnels when communicating with IPv4 nodes, so as to realize information exchange with IPv4 or IPv6 nodes respectively through this technology.

Dual-stack can be implemented on a single device, or it can be a dual-stack backbone network, what is a dual-stack backbone network? That is, all devices support IPv4 IPv6 protocol stack at the same time, connect to the decontrol of dual-stack networks, and configure IPv4 addresses and IPv6 addresses.

The problem of insufficient IPv4 addresses can be completely solved.

The ability to quickly connect to the network without manual configuration enables true plug-and-play.

The integrity and confidentiality of end-to-end communication at the network layer are guaranteed. It can greatly reduce network latency.

IPv6 is an abbreviation for "Internetprotocol version 6", which is a next-generation IP protocol designed by the Internet Engineering Task Force (IETF) to replace IPv4.

IPv6 uses a length of 128 bits and can provide 2 128 addresses, which can be said to provide IP addresses without any restrictions, and its biggest and most practical advantage is that there are enough IP addresses.

IPv6 support means that this software or ** supports users to use IPv6 networks to access applications. The characteristics of IPv6 should be like this, and it is precisely this feature that enables IPv6 to gradually replace IPv4.

1. For IPv6 addresses, its length is 128 bits, and the corresponding address space has increased from the original number by 2 128-2 32.

2. IPv6 also has a very flexible format for IP packet headers. Typically, a series of fixed-format extension headers are used to replace some of the variable-length option fields in IPv4. There is also a corresponding change in the appearance mode of the option part in IPv6, so that the router can easily pass by this option and do not do any processing, which improves the packet processing speed by a large extent.

3. In terms of IPv6, it simplifies the format of the corresponding packet header, and the corresponding fields only contain 8, so that the corresponding packet ** will be very fast, and the corresponding throughput will be improved.

4. This IPv6 can also continuously improve security. Authentication and privacy are one of the most critical features of IPv6.

5. IPv6 can support many service types.

The R&D company for IPv6 is IETF:

The corresponding full name is Internet Engineering Task Force. The company designed IPv6 to replace the popular version of IPv4. But why replace?

This is mainly due to the increasing number of computers, tablets and other related electronic products.

IPv6 is the abbreviation of "Internet Protocol Version 6", which is the next generation of IP protocol designed by the IETF to replace the current version of the IP protocol - IPv4.

Features (1) The length of the IPv6 address is 128 bits, and the address space is increased by 2 to the 96th power;

2) Flexible IP packet header format. The variable-length option fields in IPv4 are replaced with a series of fixed-format extension headers. The options section in IPv6 has also been changed, allowing routers to simply pass through the options without doing any processing, speeding up packet processing.

3) IPv6 simplifies the packet header format with only 7 fields, speeding up packets** and improving throughput.

4) Improve security. Authentication and privacy are key features of IPv6.

5) Support more service types; Added support for auto-provisioning. This is an improvement and extension of the DHCP protocol, which makes the management of networks, especially LANs, easier and faster.

6) Allow the protocol to continue to evolve, adding new features and adapting it to future technological developments.

These features can also be said to be the advantages of IPv6 over IPv4.

In addition to the above advantages, the current IPv6 also has another important advantage, that is, it is free, especially for the users of the education network, it is completely free. Because access to the education network is free, but access to the external network will be charged, but the charge is limited to IPv4, and IPv6 in the current trial stage is completely free.

Another point is that there is no GFW on IPv6 yet, and you can see the whole picture of the Internet.

At present, IPv4 and IPv6 are basically mixed networks, and ordinary users need to configure IPv6 to use IPv6. In addition, ordinary home router does not support IPv6, and users who use routers have no chance with IPv6. Resources.