What are the differences between IPv4 and 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 of the IP protocol is 4 (referred to as IPV4), the development has been used for more than 30 years. IPV4 address number of 32 digits, that is, a maximum of 2 of 32 computers can be linked to the Internet, in the last decade due to the rapid development of the Internet, IP address demand is increasing, making IP address more stringent distribution, The data indicate that the global IPV4 site may have been fully completed in 2005-2008 years.

　　What is IPV6

IPV6 is the next version of the Internet Protocol, can also be said to be the next generation of Internet Protocol, it was originally proposed because with the rapid development of the Internet, IPV4 defined limited address space will be depleted, the lack of address space will hinder the further development of the Internet. In order to enlarge the address space, it is proposed to redefine the address space through IPV6. The IPV6 uses a 128-bit address length and can provide an address almost without restriction. By conservatively estimating the actual IPv6 address, more than 1000 addresses can be allocated per square metre of the entire planet. In the process of IPV6 design, in addition to solve the problem of address shortage once and for all, it also considers other problems in IPv4, including End-to-end IP Connection, QoS, security, multicast, mobility, Plug and play, etc.

What are the characteristics and advantages of IPV6 compared with IPV4

A 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.

A 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. 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. 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. Higher security. In the use of IPV6 network users can encrypt the network layer of data and IP message verification, which greatly enhance the network security.

Through the above reading, I believe that we have a more profound understanding of the difference between IPv4 and IPv6, in fact, the only TCP/IP protocol in Windows XP is the IPV4 protocol in Windows 7, only a clearer distinction in the Windows 7 system.