Packet Forwarding via Feature Character Extraction
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Solution Overview
Problem
Existing packet forwarding technologies cannot separately forward different HTTP requests with the same 5-tuple along different paths, leading to inefficient routing in mobile networks and applications using HTTP protocols like HTTP 1.1.
Innovation Solution
A packet forwarding method that extracts feature characters from packets beyond the 5-tuple through deep packet inspection (DPI) and uses a flexible packet matching table to determine corresponding routing information, enabling packets with the same 5-tuple to be forwarded along different routes based on unique features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If packet forwarding is based on 5-tuple flow with a single path, then forwarding simplicity is maintained, but the ability to separately forward different HTTP requests with the same 5-tuple along different paths is lost
Solution Approach 1:
The patent segments the forwarding decision process into multiple independent components: 5-tuple matching for basic routing, and feature character matching for differentiated forwarding. This allows the system to handle both simple and complex forwarding scenarios without requiring complete redesign of the forwarding engine.
Solution Approach 2:
The patent adds a new dimension to packet forwarding by introducing feature characters extracted from packet content beyond the traditional 5-tuple. This enables differentiation of packets with identical 5-tuples through additional matching dimensions such as HTTP method, URL, or other application-layer features.
2Measurement precision
If deep packet inspection is performed to extract feature characters, then routing precision for differentiated forwarding is improved, but processing time and computational resources increase
Solution Approach 1:
The patent performs preliminary extraction of feature characters from packet headers or early payload sections before complete packet processing. This allows routing decisions to be made based on available features without waiting for entire packet reception or complete deep inspection, reducing processing delay.
Solution Approach 2:
The patent extracts only the necessary feature characters required for routing decisions rather than performing complete deep packet inspection of entire payloads. This selective extraction minimizes processing overhead while obtaining sufficient information for differentiated forwarding.
3Manufacturing precision
If feature character matching is implemented for packet forwarding, then forwarding accuracy for different applications is improved, but the complexity of packet parsing and feature extraction increases
Solution Approach 1:
The patent implements a universal feature character extraction mechanism that can handle multiple protocols and application types through a single parsing framework. The same extraction engine works for HTTP, HTTPS, and other protocols by adapting to different protocol structures without requiring separate parsing logic for each protocol type.
Data Source
AI summary
Embodiments disclose a packet forwarding method and device. The method includes: obtaining, by a packet forwarding device, a feature character included in a packet to be forwarded. The feature character is obtained by parsing, according to a preset packet content parsing policy, other content included in the packet to be forwarded except a 5-tuple. The method includes determining, according to a correspondence between different feature characters and corresponding routing information, routing information corresponding to the obtained feature character, and sending, according to the determined routing information, the packet to be forwarded.