| As an important infrastructure of the future national electronic information system,the Space-Air-Ground Integrated Network is a trend of future network development.At present,there are many Space-Air-Ground Integrated Network networking solutions designed on the basis of terrestrial network technology,the mainstream of which is based on the traditional Internet TCP/IP system and combined with the requirements of the Space-Air-Ground Integrated Network.However,with the development of the times,the traditional Internet TCP/IP system has highlighted more and more limitations,including network security and mobility issues brought about by the ambiguity of IP addresses.The idea of separating identifier and locator in the identifier network system proposed by Beijing Jiaotong University solves the problems caused by the ambiguity of IP addresses,but it lacks an efficient identifier mapping resolving mechanism to meet the large-scale deployment and scenarios of the Space-Air-Ground Integrated Network Complex requirements.Therefore,the design of a stable and reliable identifier mapping resolving system has very important practical significance for the identifier-based Space-Air-Ground Integrated Network.In this scenario,this paper designs and implements a distributed identifier mapping resolving system under the Space-Air-Ground Integrated Network.While satisfying the communication between users,a solution for the distributed storage and maintenance of identifier mapping entries is proposed,which improves the stability and reliability of the identifier network in the Space-Air-Ground Integrated Network scenario.The specific work of this paper is as follows:First of all,it summarizes the existing mature space-based networks at home and abroad,and the research status of the separation of identifier and locator,briefly describes the architecture of the Space-Air-Ground Integrated Network based on the identifier,and provides a way for distributed storage maintenance by analyzing the DNS protocol naming and resolution mechanism.Theoretical basis,introduced the distributed,dictionary tree and database related algorithms and technologies.Secondly,the design requirements of the distributed identifier mapping resolving system are analyzed,the system architecture and modular design are given,and the implementation of each module is explained in detail.Among them,in order to improve the performance and scalability of the system,the mapping server is managed and maintained by domains,which reduces the pressure of storage and maintenance of each server.At the same time,in response to the needs of the Space-Air-Ground Integrated Network hierarchical service,a mapping table of access identifier and routing identifier including user level,service type and other fields was constructed.On this basis,a distributed identifier mapping resolving mechanism was designed to realize the identifier mapping.Domain storage and maintenance of entries.In addition,in order to improve the operability of the system and facilitate the deployment of equipment,the user command interface and configuration file are designed and implemented.In order to support the manageability and control of the integrated world network,the My SQL database is used on the mapping server to synchronize the mapping information to the network management system.Finally,a functional test is conducted on the distributed identifier mapping resolving system built in this paper.After configuring the identifier switching router and the mapping server,the tests of mapping registration/deregistration,query reply,mobile update function and database synchronization function have been completed.The test results show that the design of the distributed identifier mapping resolving system can meet the needs of the Space-Air-Ground Integrated Network for the distributed storage and maintenance of identifier mapping entries.After summarizing the work of this article,the next research content is prospected. |
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