Cloud Packet Capture Streaming via Bytecode Filtering
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Solution Overview
Problem
Traditional packet capture methods are manually intensive, resource-intensive, and difficult to manage across multiple devices, especially when devices lack sufficient resources or are remotely inaccessible, making it challenging to configure and stream packet captures efficiently.
Innovation Solution
A cloud-managed network system that maintains persistent HTTP connections with packet capturing devices, compiles filtering rules into bytecode, and uses HTTP-chunking to stream captured packets to a management server, allowing for centralized management and merging of packet capture streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If packet capture is performed manually on each device, then filtering and storage can be done locally, but the process becomes manually intensive and difficult to manage across multiple devices
Solution Approach 1:
A management server is introduced as an intermediary between administrators and packet capture devices. The server automatically configures and manages packet capture operations across multiple devices, eliminating manual configuration steps and enabling centralized control of capture rules, filtering logic, and result aggregation.
Solution Approach 2:
The packet capture system is segmented into distinct functional components: a management server for configuration and coordination, network access devices for actual packet capture, and separate modules for filtering and analysis. This segmentation allows automated management while distributing capture functions across appropriate devices.
2Reliability
If packet capture resources are concentrated on individual devices, then local filtering and storage are possible, but devices with limited resources cannot perform deep packet capture
Solution Approach 1:
The computationally intensive filtering and analysis functions are extracted from resource-constrained network access devices and relocated to the management server. Network access devices perform only the lightweight packet capture and forward results to the server, which handles complex filtering, aggregation, and storage. This allows devices with limited resources to participate in deep packet capture operations.
Solution Approach 2:
The system shifts from a single-device resource model to a distributed network model where resources are pooled across multiple devices and centralized on the management server. Packet capture capacity is no longer limited by individual device resources but by the aggregate capacity of the network access devices and server infrastructure.
3Quantity of substance
If packet capture results are stored locally on each device, then immediate storage is possible, but devices without sufficient disk space cannot store capture data
Solution Approach 1:
Storage resources are merged and centralized on the management server rather than being distributed across multiple network access devices. The server aggregates packet capture results from all connected devices and provides unified storage capacity. This pooling approach allows the system to handle large volumes of capture data without requiring each individual device to have substantial local storage.
4Productivity
If traditional packet capture methods are used across multiple devices, then comprehensive network monitoring is possible, but merging and managing results from multiple devices becomes difficult
Solution Approach 1:
The management server acts as a central intermediary that receives, standardizes, and merges packet capture results from multiple network access devices. It provides unified configuration distribution, centralized result aggregation, and coordinated analysis across the entire network, eliminating the complexity of manually merging results from multiple sources.
Solution Approach 2:
The management server provides universal functionality for managing packet capture operations across diverse network access devices. It handles configuration generation, result reception from multiple device types, standardized filtering, and aggregated storage, making the system adaptable to various device configurations while maintaining consistent management procedures.
Data Source
AI summary
A system for streaming packet captures over the Internet includes multiple network access devices, each operating as one of a gateway device, a wireless access point, and a network switch, and a management server communicatively coupled to the network access devices over the Internet for managing the network access devices. The management server maintains a persistent hypertext transport protocol (HTTP) connection with each of the network access devices over the Internet. The management server is to generate a bytecode based on a filtering expression for packet captures (PCAPs) representing one or more PCAPs filtering rules, transmit the bytecode to the network access devices without requiring the network access devices to compile the PCAPs filtering rules, receive PCAPs from the network access devices captured by the network access devices based on the PCAPs filtering rules, and merge the PCAPs received from the network access devices into merged PCAPs.