Reverse communication method of crossing safety zone, device and system

Abstract

The invention discloses a reverse communication method of a crossing safety zone, a device and a system. The method includes sending explore packets to file gateways of isolation devices, obtaining working state information of the isolation devices through echo packets of the explore packets, comparing the working state information of the isolation devices, and choosing one corresponding gateway of one of the isolation devices to transmit a reverse communication packet according to comparison results. By means of the method, the device and the system, a communication bus crossing a safety zone can be set up, and the structure of a network can be simplified. One of working states of the isolation devices is chosen, the communication packets are coordinated for transmission, and the resource utilization rate of equipment is improved. Exchange visits of systems are benefited, and therefore system performance, expansibility and reliability are improved.

Description

technical field [0001] The invention relates to the information security technology of the power system, in particular to a reverse communication method, device and system across security zones. Background technique [0002] With the improvement of power automation level, in order to ensure the security of the network, many information security technologies have been applied in the network, such as setting up firewalls and anti-virus systems in the network, intrusion detection and vulnerability scanning for the network. However, this kind of protection is a logical mechanism, and there must be an absolutely safe gate to ensure the security strength between different security zones. To meet the security requirements of the power information network system, power-specific isolation devices have been widely used in the construction of power information networks. [0003] While the special power isolation device ensures the security of the power information network, it also bri...

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Problems solved by technology

[0003] While ensuring the security of the power information network, the special power isolation device also brings inconvenience to the intranet network communication of the information to some extent.

While realizing high-level security network isolation, the functional characteristics of the isolation device itself also determine that it will bring a certain delay and bandwidth limitation to network communication.

Relevant tests show that the traditional communication method has the following problems: First, a large number of reverse isolation devices and network channels are difficult to maintain, making it difficult to locate and eliminate faults in a timely manner; secondly, the newly constructed system needs to be eq

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