Broadcast Message Filtering in Local Area Network Topology
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Solution Overview
Problem
In local area networks, wireless communication coverage extension systems fail to properly filter messages intended for specific subnetworks, leading to security risks and operational issues, such as unintended data reception by clients connected via wired links, which can result in loss of access to the primary subnetwork due to mismatched IPv6 configurations.
Innovation Solution
A method and device that analyze the local network topology to determine filtering rules, applying these rules to broadcast packets to ensure only legitimate recipients receive messages by identifying virtual networks, dropping or transforming packets as necessary to prevent unauthorized access, using nodes capable of applying filtering rules and potentially connected switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nodes transmit broadcast messages across all subnetworks without filtering, then message delivery coverage is maximized, but security risks increase and operational problems occur due to unintended data reception by clients
Solution Approach 1:
The patent segments the local network into multiple virtual subnetworks (VLANs) including primary subnetwork, secondary subnetwork, and guest subnetwork. Each subnetwork is isolated at the data link layer, allowing broadcast messages to be confined to their intended subnetwork only. This segmentation resolves the contradiction by enabling targeted message delivery while preventing unauthorized access across subnetwork boundaries.
Solution Approach 2:
The patent introduces VLAN tags as intermediary identifiers that are inserted into Ethernet frames to mark the source and destination subnetworks. These tags act as mediators that enable routers and switches to intelligently forward or filter broadcast messages based on subnetwork identity, thus achieving secure segmented delivery without requiring complex reconfiguration of network devices.
2Device complexity
If devices receive all broadcast messages from primary and secondary subnetworks equally, then configuration simplicity is maintained, but clients may lose access to the primary subnetwork due to incorrect IPv6 configurations
Solution Approach 1:
The patent implements preliminary filtering of broadcast messages at the network infrastructure level (routers and switches) before they reach client devices. By pre-processing messages and applying VLAN-based filtering rules upstream, the system prevents clients from receiving unwanted broadcast traffic in the first place, thus maintaining device simplicity while ensuring reliable subnetwork access.
Solution Approach 2:
The patent implements a feedback mechanism where nodes analyze network topology and automatically determine appropriate filtering rules based on the VLAN configuration. This closed-loop approach ensures that broadcast filtering adapts to the actual network structure, preventing configuration errors that could lead to subnetwork access loss while maintaining operational simplicity.
3Reliability
If filtering rules are applied to broadcast packets to ensure only legitimate recipients receive messages, then security and operational reliability are improved, but network device complexity increases
Solution Approach 1:
The patent changes the parameter of message identification by introducing VLAN tags into the Ethernet frame structure. Instead of requiring complex analysis of message content or destination addresses, the system uses these standardized tags as simple identifiers that routers and switches can process efficiently. This parameter change enables reliable filtering while minimizing the complexity of implementation in network devices.
Data Source
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AI summary
The present invention relates to a method and device for managing messages broadcast in a local network comprising nodes allowing an extension of wireless communication coverage and stations, the nodes being connected to each other by a routing subnetwork, at least one node transmitting at least one wireless network called the front end network to which the stations connect, the local network comprising a primary subnetwork and a secondary subnetwork, the primary subnetwork being a subnetwork to which the links of the routing network and the nodes belong, the secondary subnetwork being a subnetwork composed of at least one station and which is isolated from the rest of the local network by a virtual network.According to the invention, a node capable of applying filtering rules: - commands (E300) an analysis of the local network topology, - determines (E301) from the local network topology the filtering rules to be applied, - applies (E302) the filtering rules determined on the broadcast packets containing at least one piece of information identifying the virtual network.