Data packet filtering method, system and device

Abstract

The invention discloses a data packet filtering method, and relates to the technical field of network security. The data packet filtering method comprises the following steps: determining parity of a source address of a to-be-processed data packet; according to the parity of the source address, acquiring a characteristic value of the to-be-processed data packet; and selecting a filtering rule of the to-be-processed data packet from the first rule or the second rule according to the characteristic value, so that the to-be-processed data packet is allowed to pass. According to the data packet filtering method, the parity of the source address of the to-be-processed data packet is determined, the corresponding characteristic value is determined according to the parity of the source address, and then the filtering rule suitable for the to-be-processed data packet is selected from the first rule or the second rule for filtering according to the characteristic value; therefore, whether the source addresses are odd numbers or even numbers, the to-be-processed data packets can be allowed to pass, and the problem that the data packets are rejected to pass by a firewall due to the fact that the source addresses are even numbers is solved.

Description

technical field [0001] The invention relates to the technical field of network security, in particular to a data packet filtering method, system and device. Background technique [0002] For more than half a century, with the rapid development and expansion of information and communication technologies such as the Internet, human information communication has become faster and faster, which has greatly improved the quality of life of the entire human being, but also made more and more people Personal privacy, important documents, and sensitive information are stolen, so firewalls emerge as an important security barrier. [0003] Firewalls can isolate connections between risky areas and safe areas, and monitor communications in and out of the network, allowing safe information to enter. However, the inventor found in work that some safe information is filtered out by the firewall and cannot enter the safe area. However, after changing the source address of the safe informati...

AI Technical Summary

Problems solved by technology

However, the inventor found in his work that some secure information is filtered out by the firewall and cannot enter the security area. However, after changing the source address of the security information, it may be allowed by the firewall to pass through

After in-depth research, the inventor found that some information, when the source address is an even-numbered IP address, cannot pass through the firewall, but when the source address is an odd-numbered IP address, it can pass through the firewall, that is, some information has the problem of odd communication and even failure

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