Packet Capture Hook for Protocol Layer State Accuracy

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Solution Overview

Problem

Network devices face inefficiencies in processing and analyzing network packets due to excess resource usage and inaccuracies in protocol layer state information, as the state determined after packet processing differs from the actual state at the time of packet entry or exit from the protocol stack.

Innovation Solution

Implementing a system that captures packets at a specific protocol layer and determines the protocol layer state at the time of packet receipt, using network traffic monitoring parameters to configure packet capture and state determination, allowing for accurate representation of the network device's state and improved debugging and configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If packet capture is performed after packet processing, then the network device can process packets through the protocol stack, but the protocol layer state information becomes inaccurate because the state changes during processing

Engineering Contradiction:
Improveaccuracy of protocol layer state informationVSAvoidpacket processing throughput
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by capturing packets at a specific hook point in the protocol stack before the packet processing completes and state changes occur. The system establishes a hook that intercepts packets at the protocol layer entry point, allowing state information to be captured in its initial accurate state before any processing modifications occur.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary mechanism in the form of a hook function that mediates between packet arrival and full processing. This hook acts as an intermediate capture point that allows the system to obtain packet information and protocol state at a controlled moment without blocking the entire processing pipeline, thus maintaining accuracy while preserving throughput.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Measurement precision

If packet capture is performed at the protocol stack entry point, then accurate protocol layer state information is obtained, but resource utilization increases due to additional capturing and state determination operations

Engineering Contradiction:
Improveaccuracy of protocol layer state informationVSAvoidresource utilization
Core Design Contradiction:
Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by implementing packet capture and state determination only at specific protocol layers where needed, rather than throughout the entire stack. The system allows selective capture at the entry point hook and only processes state information for packets that match capture criteria, reducing unnecessary resource consumption while maintaining accuracy where required.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements partial action by capturing only the necessary protocol state information at the hook point rather than capturing everything. The system determines and stores only the relevant state parameters needed for debugging and monitoring, avoiding the excessive resource consumption that would result from capturing all possible packet data and state information.

Inventive Principle:
Principle #16Partial or excessive action

3Speed

If the network device monitors the network interface continuously, then real-time packet information is available, but processing overhead increases due to continuous monitoring and analysis

Engineering Contradiction:
Improvereal-time packet information availabilityVSAvoidprocessing overhead
Core Design Contradiction:
SpeedVSDevice complexity

Solution Approach 1:

The patent extracts the packet capture function from the main processing loop by using a hook mechanism that captures packets at the protocol stack entry point. This extraction allows real-time information availability without requiring continuous monitoring and analysis of all packets, as only packets entering the stack at the hook point are captured, reducing processing overhead while maintaining real-time capability.

Inventive Principle:
Principle #2Taking out (Extraction)

Data Source

PatentUS10291496B1Packet capture based capturing of protocol layer state information
Publication Date: 2019.05.14 JUNIPER NETWORKS INC
  • US10291496B1 patent drawing
  • US10291496B1 patent drawing
  • US10291496B1 patent drawing

AI summary

A device may determine a set of network traffic monitoring parameters associated with identifying a packet for capture. The set of network traffic monitoring parameters may identify a particular protocol layer at which to perform packet capture. The device may configure packet capture and protocol layer state determination based on the set of network traffic monitoring parameters. The device may perform packet capture of the packet at a time when the packet is received at a protocol stack associated with the particular protocol layer based on configuring packet capture and protocol layer state determination. The device may determine a protocol layer state at the time when the packet is received at the protocol stack based on configuring packet capture and protocol layer state determination. The device may provide information identifying the packet and/or the protocol layer state.