Multiple Link Layer Addresses for LAN Privacy and Continuity
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Solution Overview
Problem
Devices operating in local area networks face challenges in balancing LAN communications with user privacy, as changing MAC addresses interrupts communications and conflicts with security keying algorithms, while traditional globally unique MAC addresses compromise privacy.
Innovation Solution
Implementing a LAN MAC protection feature that uses multiple link layer addresses, where a first address remains unchanged and a second address can be changed, allowing seamless communication and privacy preservation by tunneling the unchanged address and using the changing address for wireless communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a device changes its MAC address to preserve user privacy, then observer tracking is mitigated, but LAN communications are interrupted and security keying algorithms conflict
Solution Approach 1:
The patent segments the MAC address functionality into two distinct addresses: a first MAC address used for wireless communications that can be changed, and a second MAC address used for LAN communications that remains unchanged. This segmentation allows the device to preserve privacy in wireless communications while maintaining reliable LAN communications by keeping the LAN MAC address static, thus resolving the contradiction between mitigating observer tracking and ensuring communications continuity.
2Reliability
If a device uses a globally unique MAC address for LAN communications, then communication reliability is maintained, but user privacy is compromised
Solution Approach 1:
The patent divides the addressing system into two segments: a first MAC address for wireless communications that can be dynamically changed to protect privacy, and a second MAC address for LAN communications that remains static to ensure reliability. This allows the device to use a globally unique address for LAN communications while protecting user privacy in wireless contexts through address rotation, thus resolving the contradiction between communication reliability and privacy protection.
3Object-affected harmful factors
If a device uses multiple link layer addresses, then privacy and communication reliability are both preserved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of an access point that manages the mapping between the first MAC address (used in wireless communications) and the second MAC address (used in LAN communications). This intermediary handles the complexity of address management, allowing the device to benefit from multiple addresses for privacy and reliability without bearing the full burden of address management complexity, thus resolving the contradiction between privacy protection and device complexity.
Data Source
AI summary
A device includes a link layer configured to use a first link layer address and a second link layer address, maintain the first link layer address unchanged for a duration of an association of the device with a wireless network, and change the second link layer address from a first value to a second value during the duration.