Packet processing method, communication apparatus, storage medium and program product

By introducing a preset cache to store non-contiguous sequence numbers at the IPsec receiver, the problem of packet loss due to out-of-order delivery in IPsec packet transmission is solved, achieving resource conservation and low-cost deployment, and is suitable for high-speed network environments.

WO2026113874A1 Publication Date: 2026-06-04HUAWEI TECH CO LTD
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Patent Information

Application Number
PCT/CN2025/132940
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-11-26
Filing Date
2025-11-06
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

During IPsec packet transmission, packet loss due to out-of-order delivery is a problem that existing technologies, such as widened sliding windows or parallel IPsec SA solutions, cannot effectively solve, especially in high-speed network environments, and consume too much resources.

Method used

A preset buffer is introduced at the receiving end to store sequence numbers that are not consecutive with the sequence numbers in the sliding window. By comparing the sequence number of the IPsec packet to be processed with the results of the sliding window and the preset buffer, the IPsec packet to be processed is subjected to anti-replay processing to avoid accidental dropping caused by the sudden pulling of the sliding window.

Benefits of technology

It effectively avoids the accidental discarding of low-priority IPsec packets due to their sequence number being less than the trailing edge of the sliding window, saving system resources, reducing deployment costs, and offering good compatibility, making it suitable for single-sided deployments.

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Abstract

The present application relates to the field of communications. Disclosed are a packet processing method, a communication apparatus, a storage medium and a program product. The method comprises: a communication apparatus acquires a sequence number of an Internet protocol security (IPsec) packet to be processed, and then, on the basis of comparison results between the sequence number of said IPsec packet and sequence numbers recorded in a preset buffer and between the sequence number of said IPsec packet and sequence numbers in a sliding window, performs anti-replay processing on said IPsec packet, the preset buffer being used for recording sequence numbers that are currently discontinuous with the sequence numbers in the sliding window. In the method, when the communication apparatus performs anti-replay processing, sequence numbers of out-of-order packets can be stored in the preset buffer, so as to avoid sudden large window advancements, thus avoiding erroneous drops of IPsec packets.
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