I. Objectives of the main work of IPV6 The address space of IPV4 is too small, and security is not considered enough, because when IPV4 was designed, it only considered the ****enjoyment of information resources, and didn't give much consideration to the need for security. Thus with IPV4's inherent lack of security, IPV6 began to consider solutions to both of IPV4's deficiencies. With the combination of IPV6 and mobile communications, mobile communications began with circuit-switched, and now with packet-switched, there is a lot of flexibility, which will reduce the cost of operation. In that case, the telecom industry would love to be able to handle telecom traffic in a packet-switched manner in IPV6. (Slide) This is how some of the main networks, such as home appliances and Internet café equipment, can be connected in a network, and they all want to be realized under the IPV6 framework. This expands the goal of IPV6. IPV6 is involved in the development of the IETF, which is a project to develop IT protocols; the other one is the mobile communication has 3GPP, which is the Third Generation Partnership Project Group, and they are also developing protocols for IPV6-related applications. This is the IETF and 3GPP, because the latter two aspects have made great progress, so the cooperation, the fourth is the ITU, which is very important, how to use IP to support telecommunications, but also made a lot of efforts, and now there are a lot of achievements have been reflected in practice. Second, what are the security considerations of IPV6 IPV6 has been realized based on the network layer of authentication and encryption processing, called IPSEC. there are two considerations, one is called encapsulation of security load, one is called authentication packet header, you can achieve a certain level of security. Now based on the IP operations layer are built on the IPSec protocol, in order to transition, in IPV4 can also run IPSec protocol. As the main standard component of IPV6, the IPSec protocol itself has several shortcomings, the first shortcoming is that this protocol only runs on the network layer, the application layer security requirements can not be realized. The second shortcoming is that the processing of these two protocols affects the implementation of existing network security protocols. For example, like AH detection, firewall filtering, if you want to add the IPV6 packet header, the original intrusion detection does not know the original destination address, so the scanning can not be well realized. The next step for manufacturers of network security equipment presents a new challenge. Third, IPV6 compatibility strategy because IPV6 is developed in IPV4. The original IPV4 address is relatively small, in IPV6 has been a lot of expansion, this is because IPV4 is a 32-bit stream to represent an address to IPV6 is expanded to 128 bits, the scale of the four times enlarged, the number of users that can support the number of users or the number of end-users will be enlarged a lot of the specific number is a very long string of numbers, you can represent every molecule on the planet. IPV4 is a structured representation of the address, divided into class A, class B, and class C addresses. IPV6 is divided into three levels called TLA, NLA, and SLA, which are called top-level aggregation, secondary aggregation, and bottom-level aggregation, so that the resources can be reasonably allocated, and the belonging of each resource can be judged based on the address. IPV6's development of IPV4 is to support wireless LANs. For example, home appliances, refrigerators, and washing machines can be connected to the network, and each device can be assigned an IP address or two IP addresses, as well as sensors, added together, and the whole is connected to a network. As Mr. Xu Rongsheng introduced the high-speed network transmission together can realize the future of grid computing. IPV6 than IPV4 added QS, that is, quality, or quality control. This is critical to the delivery model of streaming media over the network. Let's look again at the succession of IPV4 and IPV6. While IPV4 currently has changes that have extended the packet header and already supports some features, IPV6 merely normalizes the extensions of IPV4. Fifth, how to expand and its development prospects Put our equipment to use, to build our applications, there is no such support, empty talk on the application of no value at all. How to apply this place, should be considered in these areas. The first is that it is applied to the control of home appliances, adding cell phones and PDAs. At the same time, because IPV6 replaces IPV4, secretly realize the concept of the previous hype, can realize the triple play. At the same time, grid computing, high-definition television, telemedicine, etc. can be integrated together, so that the network really becomes an information superhighway. IPV6 technology to promote the existence of problems there should be so many, the first is not much research on the service, how to adjust the IP layer of the upper layer of the protocol, the previous international standards organization (IETF) to do this, such as process protocols, such as the WAP protocol, no one to do! These things, how to adapt to IPV6 has not been done. Another thing is the security model of IPV6, which is very clearly not harmonized with the security model of OSI. There is a big difference because the filtering model is used, not the service model, which is used by OSI. Products have to be rolled out continuously. For more, please see the Cisco and Huawei Technology Network (Vlan9.com) ATM Networking Technology Tutorials IPv6 Protocols IPV6 topic topic, or go to the forum to discuss.
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