Shulou(Shulou.com)06/01 Report--

I. what is cross-network?

Cross-network refers to the network that can not be directly connected between the Internet and the local area network. These Lans can be separate Lans with high confidentiality, public security networks, military networks and so on.

Second, why should it be transmitted across networks

Take the public security network as an example, the public security network has higher requirements for data security, so it is not directly connected to the Internet. However, our system may need to run on both the Internet and the public security network, so the business data must be related and need to be transmitted to each other.

Third, the solution.

Cross-network data exchange is mainly divided into two ways, one is the optical disc ferry, the other is the light gate.

To put it simply, the optical disc ferry machine first uses the optical disc to record the information that needs to be transmitted, then uses the robotic arm to change it to the other end of the network that needs to be exchanged, and then reads and stores it, thus completing an one-way transmission. This method has the advantages of slow speed and high packet loss rate, but meets the information security requirements of complete physical isolation, and is used earlier than the shutter.

Shutter, referred to as FGAP in English, is a unidirectional isolation software and hardware system based on light, which is developed on the basis of security isolation gate (GAP).

Files can be transferred on the media of data transfer, or a specific table of a database can be agreed upon.

4. Pay attention

When we exchange data, regardless of the optical disc ferry machine or the optical gate, there is a certain delay, so the transmission of the same table generally cannot be transmitted in both directions, but takes the high-level encryption end as the main library. the low-level end of the data is mainly exchanged to the high-level end.

When exchanging data, the receiving end needs to parse and process the transmitted data in the form of a scheduled task.

Due to the possibility of loss in data exchange, in order to ensure that the data is ready to be transmitted, it is necessary to back up the transmission history at the transmission end, and after receiving the data, give the transmission end a receipt. Tell the transmission side that the data has been received and then delete the history file. If the transmission history file is still there for a long time, it needs to be retransmitted.

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