Remote IT Device Wake-Up via IP Network Management
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Solution Overview
Problem
Wake-on-LAN (WOL) technology is limited in remotely activating IT devices outside their subnet due to the requirement for layer 2 connections, making it difficult to maintain IP network connections for inactivated devices, as routing information is often deleted after a certain time, and existing solutions for maintaining this connection are complex and not widely used.
Innovation Solution
A network management apparatus and method that generates detection patterns containing ARP and WOL bit patterns to identify and wake up IT devices over an IP network, using a remote state controller to analyze data streams and generate interrupts for activating or maintaining the CPU state, and an IP layer WOL detector to handle WOL packets, allowing remote state control without modifying network infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Wake-on-LAN is used to activate IT devices, then power consumption is reduced by allowing devices to remain inactive, but the device cannot respond to network messages from outside its subnet because routing information is deleted
Solution Approach 1:
The system performs preliminary actions by maintaining routing information tables even after devices enter inactive state, and by pre-configuring the network management apparatus to detect and forward WOL messages. This ensures that when a device needs to be activated from outside its subnet, the necessary network pathways are already in place, resolving the contradiction between power saving and connection maintenance.
Solution Approach 2:
The network management apparatus acts as an intermediary between external nodes and inactive IT devices. It receives WOL messages from external subnets, detects the target device, and forwards the messages through the network, enabling remote activation without requiring direct layer 2 connectivity between the external node and the inactive device.
2Reliability
If routing information is permanently maintained for inactive devices, then network connection is preserved, but system complexity and security concerns increase
Solution Approach 1:
Instead of permanently maintaining all routing information, the system maintains routing information for a predetermined period after device inactivation. This partial action approach preserves necessary connections for WOL activation while avoiding the full complexity of permanent maintenance, striking a balance between reliability and system simplicity.
Solution Approach 2:
The network management apparatus automatically detects inactive devices and manages routing information without requiring manual configuration or complex security policies. The system self-regulates by monitoring device states and automatically maintaining or deleting routing information as needed, reducing operational complexity.
3Reliability
If layer 2 WOL broadcasting is used within a subnet, then devices can be activated reliably, but the method cannot be applied to remote nodes outside the subnet
Solution Approach 1:
The system transitions from layer 2 broadcasting (physical/subnet level) to layer 3 routing (network/IP level). By using IP-based routing and the network management apparatus to forward messages, WOL activation extends beyond the physical subnet boundary, enabling remote node compatibility while maintaining reliable message delivery through structured network pathways.
Solution Approach 2:
The network management apparatus serves as an intermediary that bridges the gap between external subnets and internal inactive devices. It receives WOL messages from external nodes, detects the target device within its subnet, and forwards the messages appropriately, enabling remote activation without requiring changes to the core WOL mechanism.
Data Source
AI summary
A network management apparatus and method for remotely controlling a state of an IT device in order to use WOL to change a remote device from an inactive state to an active state over an IP network. The network management apparatus includes a detection pattern generator, a remote state controller, and a wake-up cause analyzer. By activating an inactivated PC connected over an IP network and positioned at a remote site using WOL to control a state of another IT device interoperating through the IP network as well as a state of the PC, it is possible to inactivate the device without unnecessarily having to leave the device on and then control the device as necessary, thereby reducing power consumption of the device and extending a lifetime of the device.