Session-Based Packet Capture for Network Traffic Analysis
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Solution Overview
Problem
Conventional packet capture techniques in computer networks are inefficient as they capture packets on a per-packet flow basis, leading to high network resource consumption and incomplete records of bidirectional traffic flows, which hinder accurate traffic engineering and monitoring.
Innovation Solution
Implementing session-based packet capture, where routers generate records for each session including both forward and reverse packet flows, and modify packets with a header and metadata to indicate whether capture is required, allowing for targeted and efficient data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If packet capture is performed on a per-packet flow basis, then packet records can be generated for individual flows, but network resource consumption increases significantly and bidirectional traffic flow completeness is lost
Solution Approach 1:
The patent merges forward and reverse packet flows into a single session-based capture record. Instead of treating packet flows independently as in conventional per-flow capture, the system combines bidirectional traffic between the same pair of endpoints into one unified session record, thereby reducing the number of separate records while maintaining complete traffic flow information.
Solution Approach 2:
The patent segments packet capture by session rather than by individual packet flow. By defining sessions based on endpoint pairs and combining bidirectional flows within each session, the system creates more efficient capture records that reduce network resource consumption while preserving traffic analysis accuracy.
2Loss of information
If flow-based packet capture is used, then packet records can be transmitted to collectors for analysis, but the volume of data increases and relevant data is diluted
Solution Approach 1:
The patent merges bidirectional packet flows into single session-based records, reducing the total number of separate records and data volume while maintaining complete traffic behavior information. This consolidation eliminates redundant data without losing any relevant traffic analysis information.
Solution Approach 2:
The patent extracts and transmits only the necessary session-level packet capture records to collectors, rather than transmitting all individual packet flow records. This extraction approach filters out redundant data while preserving the essential traffic behavior information needed for analysis.
3Adaptability or versatility
If conventional per-flow packet capture is implemented, then routing decisions can be made based on packet flows, but session-based routing capabilities are limited
Solution Approach 1:
The patent introduces dynamic session identification and management capabilities to the packet capture system. By implementing session-based capture with flexible session criteria and dynamic record generation, the system adapts to different routing scenarios and provides versatility for session-based routing decisions without requiring overly complex infrastructure.
Data Source
AI summary
Techniques are disclosed for generating session-specific packet capture records. In one example, a first network device receives a first packet of a session between first and second client devices, the session comprising forward and reverse packet flows. The first network device modifies the first packet to include metadata comprising a packet capture indicator that indicates whether packet capture is to be performed for the session. The first network device stores at least a portion of the first packet and each subsequent packet of the session and forwards the modified first packet. A second network device receives the modified first packet and, based on the packet capture indicator, stores at least a portion of the first packet and each subsequent packet of the session in a session-specific packet capture record. The first and second network devices may generate, from the stored packet data, a packet capture record for the session.