Multi-homed Device Internet Reachability Detection
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Solution Overview
Problem
Multi-homed network devices typically connect to the Internet through a single default gateway, failing to detect and switch to alternative interfaces when the primary gateway becomes unavailable, leading to interrupted Internet connectivity.
Innovation Solution
A method that determines Internet reachability for each network interface before setting it as the default route, allowing for dynamic switching based on preference configurations and continuous monitoring to ensure high availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single default route entry is configured in the network routing table, then the device can maintain a simple routing structure, but the device cannot switch to alternative Internet gateways when the primary gateway becomes unavailable
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple route entries in the routing table before network interface failures occur. The system pre-establishes alternative routes through multiple Internet gateways, so when the primary gateway fails, a backup route is already available for immediate activation without requiring complex real-time routing decisions.
Solution Approach 2:
The patent implements feedback mechanisms through reachability detection that continuously monitors whether the current default gateway is accessible. When the detection determines the primary gateway is unreachable, the system automatically switches to an alternative gateway. This closed-loop feedback system maintains simple routing table management while ensuring high availability through automatic failover based on real-time gateway status monitoring.
2Reliability
If the device automatically switches between multiple Internet gateways, then uninterrupted Internet connectivity is achieved, but the device requires complex monitoring and switching mechanisms
Solution Approach 1:
The patent applies self-service by implementing automatic gateway switching that operates without user intervention. The reachability detection system continuously monitors gateway status and automatically activates alternative routes when failures occur, eliminating the need for users to manually configure or manage gateway switching. The system serves itself by autonomously detecting failures and executing failover procedures.
Solution Approach 2:
The patent uses preliminary action by pre-configuring multiple route entries and establishing the infrastructure for automatic switching before failures occur. The routing table is pre-populated with alternative gateways, and the switching logic is pre-programmed, so when failures occur, the system can immediately execute the predetermined switching sequence without requiring complex real-time decision-making or user input.
3Adaptability or versatility
If multiple network interfaces are configured for Internet connectivity, then failover options are available, but the device cannot determine which interface should be the default gateway
Solution Approach 1:
The patent implements feedback through reachability detection that actively tests whether each configured network interface can successfully reach Internet gateways. The system sends detection packets through each interface and monitors the responses to determine which interfaces are functional. This feedback mechanism provides clear, measurable data about interface reachability, enabling the system to automatically select the appropriate default gateway based on actual connectivity status rather than static configuration.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple route entries corresponding to different network interfaces before connectivity issues occur. The routing table is prepared with alternative paths through Wi-Fi, Ethernet, and other interfaces, so when the system needs to determine the default gateway, it can evaluate the pre-established options based on reachability detection results and activate the most suitable interface.
Data Source
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AI summary
A method for determining Internet reachability and Internet high availability for a multi-homed device in a network having a plurality of network interfaces includes connecting the multi-homed device to a network interface of interest in the plurality of network interfaces and disabling any functionality of setting a default route entry for the at least one network interface of interest until a determination of Internet reachability is made.