Research On Method Of High Reliable Data Transmission Over Unidirectional Link

In order to eliminate information leakage of secret networkcompletely,unidirectional link communication that has no feedback become more feasible technical scheme of physical isolation in field of network security. However, due to unidirectional link only has one-way transmission capacity, we can't ensure the reliability of data transmission through response mode in this environment, in order to meet the communication of high security network, the unidirectional transmission focuses on reliability problems of isolation technique.This paper using general components design unidirectional link based on the spectral reduction technology, and combining the ErasureCode, PF_RING, one-way communication technology, we design system protocol based on the analysis of the UDP protocol, and design different one-way control strategy based different transmission rate.According to testing, finally realizes the anticipate target of one-way import, high-speed transmission, security isolation, reliable transmission.Specific research work are as follows:1. Research the correlation between transmission rate and the packet loss rate in unidirectional link. With the change of the transmission bandwidth, packet loss rate has obvious changes, based on the correlation, this paper will put forward two different control strategies in one direction.2. Within the scope of the link bandwidth in unidirectional link, as the link or device errors still exists a certain percentage of packet loss, this kind random packet loss in discrete distribution, there is no correlation between each other. An adaptive coding method based on the maximum transmission rate was proposed in this paper, namely one-way control mechanism was adopt based on ErasureCode algorithm under low packet loss rate to adjust coding strategy based on maximum rate, and establish redundancy check between the transmissions of message, get back the lost packets as high as possible.3. With the increase of transmission rate, packet loss rate is rapidly increasing and appear congestion packet loss, only use remedy delete code to improve fault tolerance cannot achieve the ideal effect, in orderto continuous packet loss, using interleave coding between the transmission group on the basis of remedy delete code, so continuous can distribute to different transmission group, improve the fault-tolerant performancefurther.4. To test the two one-way control strategy in the actual link packet loss environment and Gilbert network packet loss model, theresults show that the one-way control strategy in different of unidirectional link environment to further reduce the packet loss rate, it can improve the fault tolerance of one-way transmission to achieve high reliability.In this paper, as the correlation of packet loss rate and transmission bandwidth, proposed one-way the research on how to guarantee the reliability of the one-way link communications, provides a solution it has important theoretical significance and practical significance.