IPv6 SLAAC Router Advertisement Prefix Differentiation
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Solution Overview
Problem
Current Stateless Address Auto-Configuration (SLAAC) systems lack a simple and effective method to provide distinct IPv6 prefixes based on client identity, preventing service providers from differentiating between devices within the same local area network and implementing features like prioritizing IP traffic.
Innovation Solution
The method involves using SLAAC to determine eligibility for special treatment based on link-layer addresses or supplementary criteria, sending targeted unsolicited unicast router advertisements with special or poison prefixes to UE devices, allowing them to form or delete interface addresses accordingly, thereby enabling differentiated prefix assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional SLAAC is used to provide IPv6 prefixes to all devices, then all devices can obtain network connectivity, but service providers cannot differentiate between devices or implement prioritized traffic handling
Solution Approach 1:
The patent applies local quality by sending different prefix information to different UE devices based on their link-layer addresses. Eligible devices receive special treatment with specific prefixes while non-eligible devices receive base prefixes, creating differentiated network treatment at the individual device level within the same LAN
Solution Approach 2:
The patent segments the prefix assignment process into two distinct paths: one for eligible devices receiving special prefixes and another for non-eligible devices receiving base prefixes. This segmentation is achieved through unicast router advertisements targeted at specific devices based on their link-layer address eligibility
2Adaptability or versatility
If unicast router advertisements are sent to specific UE devices, then differentiated prefix assignment is achieved, but network traffic overhead increases
Solution Approach 1:
The patent extracts the prefix delivery mechanism from the traditional multicast approach and applies it selectively to individual UE devices through unicast router advertisements. This extraction allows targeted delivery only to devices that need differentiated treatment, reducing unnecessary network traffic compared to sending individualized messages to all devices
3Adaptability or versatility
If poison base prefix is sent to UE devices, then existing base prefix addresses are invalidated, but this may cause address configuration disruption
Solution Approach 1:
The patent applies preliminary action by first sending the poison base prefix to invalidate existing base prefix addresses, and then subsequently sending the special prefix information. This sequential approach ensures that devices are properly reconfigured with new addresses while maintaining network control, as the poisoning action is performed in advance before the new address assignment
Data Source
AI summary
Systems and network devices configured to use Stateless Address Auto-Configuration (SLAAC) to provide different internet protocol (IP) address information to user equipment (UE) devices that are connected to the same local area network (LAN). A network device (e.g., default router, etc.) may determine whether a UE device is eligible to receive special treatment based on a link-layer address of the UE device. The network device send the UE device an unicast router advertisement that includes a special prefix in response to determining that the UE device is eligible to receive special treatment. The network device may send the UE device an unicast router advertisement that includes a base prefix for the LAN in response to determining that the UE device is not eligible to receive special treatment.