Design About The Access Solution Of IOT Terminal Nodes Under The Transition Of IPv6

In the IPv4 network,although the depletion can be alleviated by the NAT technology,new problems for the network equipment consumption and the access of the hosts behind NAT are presented by the construction of the multilayer network structure.These problem can be solved by the IPv6 technology from 128-bit address.So the IPV6 has been guessed as the future trend of network development.The upgrade process from IPv4 to IPv6 cannot be completed at one time,so in the upgrade process,a long period of transition has to be faced.During the transition period,there are several major problems to be solved.The first problem is that,if the way for promoting IPV6 is upgraded region by region,how the mutual access between regions should be realized across the IPv4.Secondly,the old devices with single protocol are possible to be applied in the two generation networks,how to make the device be compatible with the two kinds of network.The final problem is that due to the needs of some organizations or equipment,certain IPv4 networks have to be continuously used for a long period of time and to be communicated between IPv6 network equipment and IPv4 network equipment.In this thesis,the research will be carried out in two aspects to make the Io T end node be inserted during the IPv4 to the IPv6 transition period: firstly,different protocol nodes should be compatible through the network environment transition protocol;secondly,with the dual stack technology of end node,make the networks of different protocols be compatible.Through the network transition technology,the solution to make the different protocol nodes compatible is that the supported transition technologies on network equipment being used.Without the device upgraded,the network should be built that can make devices of different network types compatible.This kind of technology can be divided into two categories of the tunnel technology and translation technology.IPv6-over-IPv4,ISATAP,6to4 and Teredo are seen as common tunnel technologies.And NAT-PT,NAPT-PT and NAT64/DNS64 are the common translation technologies.In this thesis,each technology will be cross-sectional compared.At the same time,the simulation will be carried out to make the IPv6 server accessed by the Io T node located in the IPv6 island through the ISATAP tunnel technology.Another simulation,IPv6 network end node will be visited by old networking equipment with only the IPv4 protocol supported and located in the IPv4 network by the NAT-PT Technology.Dual stack protocol is used in the solution which can keep compatible with different network. The dual stack technology is used to make the network access mode been choosed by the end node under different networks to make the cloud server accessed.The Lw IP2.0 which have good support for the dual stack are selected,and the end node of Io T based on embedded system is designed to be applied in the end node of network environment in transition.In the scheme,STM32F429 controller is adopted as the core,the ENC28J60 is used as a network controller,the Free RTOS operating system and the Lw IP protocol stack are operated.So the dual stack protocol communication has been achieved.