Virtual Network Interface Packet Filter Hooks
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Solution Overview
Problem
Conventional packet sniffing at the network interface card (NIC) level increases processor demand and captures unnecessary data, limiting efficiency and providing limited insights into other processes affecting packets, as it operates at layer 2 Media Access Control processing.
Innovation Solution
Implementing packet filter hooks at various points in layer 3 Internet Protocol processing to selectively capture and analyze packets, allowing for more targeted and efficient packet sniffing without the need for NIC promiscuous mode, and enabling diagnostics of layer 3 processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If packet sniffing is performed at the NIC level in promiscuous mode, then all network traffic can be captured for analysis, but processor demand increases and unnecessary data is captured
Solution Approach 1:
The patent segments the packet capture function by introducing a virtual network interface that separates packet filtering from the physical NIC. The virtual interface divides packet processing into stages: initial filtering at the virtual interface level (before full packet capture) and selective capture of only relevant packets. This segmentation allows the system to capture complete traffic for analysis while avoiding processor overload by filtering packets at multiple levels.
2Loss of information
If packet sniffing is performed at the NIC level, then all traffic is captured, but more data than necessary is captured reducing efficiency
Solution Approach 1:
The patent applies preliminary action by performing packet filtering at the virtual network interface level before packets are fully captured and processed. The virtual interface pre-filters packets based on capture rules, eliminating unnecessary data before it reaches the packet sniffing function. This preliminary filtering action improves efficiency by reducing the volume of data that requires full processing while ensuring all relevant packets are captured.
3Loss of information
If packet sniffing occurs at layer 2 MAC processing, then packets are captured early, but information about other processes affecting packets is limited
Solution Approach 1:
The patent adds another dimension to packet capture by implementing a virtual network interface that operates between layer 2 MAC processing and layer 3 IP processing. This intermediate layer provides an additional observation point that captures packets after MAC processing but before IP processing, enabling analysis of both layer 2 and layer 3 processing effects. This dimensional addition enhances diagnostic capability by providing comprehensive packet processing information.
Data Source
AI summary
Systems, methods, and other embodiments associated with using packet filter hooks to selectively re-direct network packets to a virtual network interface are described. In one embodiment, a method includes re-directing a network packet at a filter hook point in an Internet Protocol processing stack. The example method may also include re-directing the network packet to a virtual network interface.