Design And Implementation Of Data Traversal Mechanism For Smart Collaborative Network Supporting Subnet Movement

Heterogeneous networks are composed of different types of networks.These networks perform well in different application scenarios,but their respective shortcomings will also be merged.The cross-effects of these shortcomings lead to worse data transmission performance.In a mobile environment,the use of heterogeneous networks for multilink transmission to provide users with reliable network access services has become a research hotspot.Multi-link transmission equipment will cross different independent areas in a heterogeneous network during a large-scale rapid movement.The network equipment in these areas have different forwarding rules for data packets in network links of different standards.Certain IP port combinations may be restricted by unknown network equipment and mechanisms,and data cannot be transmitted.Data transmission in mobile scenarios requires real-time detection of available IP port combinations in different network areas.As the number of connected mobile users increases,the corresponding relationship between link available paths and users will become more complicated.In view of the above background,in order to improve the survivability of large-scale user data packets in a large-scale mobile scenario in a heterogeneous network,this dissertation designs and implements a data traversal mechanism for smart collaborative networks supporting subnet movement.The main work and innovations are as follows:First,it introduces the overall framework of the data traversal mechanism of the smart collaborative network that supports the movement of subnets.Based on the smart collaborative routing system developed under the idea of "smart collaborative network",In this dissertation,the network segment address of the subnet is used to uniformly represent users,so as to simplify the complexity of data traversal for a large range of users,and by separating the function of providing subnet information from the process of data transmission,the flexibility of the system to analyze subnet information is improved.Secondly,explore the available paths of data transmission from the two perspectives of the same protocol and different protocols,and carry out data traversal.Detect the available path IP and port characteristics under the same protocol,the traditional port detection scenario is relatively simple.Firstly,it does not consider address switching in mobile scenarios.Secondly,it does not pay attention to the possible NAT address translation mechanism and packet loss scenarios in heterogeneous networks.Thirdly,only one end is detected,and the two-way path cannot be detected.In response to the above problems,this dissertation designs and implements a data traversal mechanism under the same protocol,which can detect network address switching in motion in real time,and perform two-way detection through the cooperation of both ends,eliminate the impact of NAT,and improve detection in a packet loss environment,and finally propose an optimization plan for the excessive number of detection data packets.At the same time consider the transmission path under different protocols as a supplement,this dissertation proposes the switching mechanism of IPv4 protocol and IPv6 protocol link.When the available path of a single protocol link is restricted,try to use different protocols to transmit user data packets to further improve the survivability of data packets.Finally,this dissertation tested the mechanism to verify the specific functions of each module,and tested the guarantee of the data transmission performance of the smart collaborative routing system by enabling data traversal when the intermediate device restricts the available path,and the module's immunity to packet loss.Tests have shown that this mechanism can flexibly ensure the high survivability of data packets of multi-segment subnet users in a wide range of heterogeneous networks.