Dual-Stack Relay for IPv4 to IPv6 Tunnel Conversion
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Solution Overview
Problem
The transition from Internet Protocol version 4 (IPv4) to IPv6 is hindered by the limitations of existing protocols, such as the 6 to 4 protocol, which lacks guaranteed reachability and quality of service, and the minimal implementation of the 6rd protocol, making it difficult for ISPs to deploy IPv6 to end users.
Innovation Solution
Implementing network address translation (NAT) techniques to transform IPv4 packets encapsulating IPv6 packets into IPv6 packets configured according to the 6rd protocol, allowing network devices to convert between different tunneling protocols and facilitate a smoother transition from IPv4 to IPv6 networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the 6 to 4 protocol is used for IPv6 transition, then protocol compatibility is improved, but reachability and quality of service deteriorate
Solution Approach 1:
The patent introduces a dual-stack relay device as an intermediary that receives 6 to 4 tunneling packets, extracts the embedded IPv6 packets, and forwards them through 6rd tunneling. This mediator resolves the contradiction by maintaining compatibility with the widely-deployed 6 to 4 protocol while improving reachability through the more reliable 6rd protocol for IPv6 packet delivery.
2Adaptability or versatility
If the 6 to 4 protocol is used for IPv6 transition, then protocol compatibility is improved, but quality of service deteriorates
Solution Approach 1:
The dual-stack relay device acts as a quality of service improvement point by receiving packets from the 6 to 4 protocol and re-encapsulating them using 6rd tunneling. This intermediary approach maintains backward compatibility while enabling better QoS control and reachability guarantees that the original 6 to 4 protocol cannot provide.
3Reliability
If the 6rd protocol is implemented, then reachability is improved, but implementation complexity increases
Solution Approach 1:
The patent combines both 6 to 4 and 6rd protocol capabilities within a single dual-stack relay device. This merging approach allows the system to leverage the reachability improvements of 6rd while managing implementation complexity by integrating both protocol stacks and tunneling mechanisms in one unified device that can perform protocol conversion.
4Productivity
If protocol transition is attempted, then IPv6 deployment is improved, but transition smoothness deteriorates
Solution Approach 1:
The dual-stack relay device serves as a smooth transition intermediary by accepting 6 to 4 packets from legacy systems and converting them to 6rd packets for modern IPv6 networks. This intermediary mechanism enables gradual IPv6 deployment without requiring immediate end-to-end 6rd implementation, thereby smoothing the transition process while advancing IPv6 adoption.
Data Source
AI summary
An example network device includes one or more network interface cards and a control unit. The network interface cards are configured to send and receive messages with a first network operating in accordance with a first network-layer protocol and a second network operating in accordance with a second network-layer protocol and a control unit. The control unit is configured to receive a message via the one or more network interface cards, transform the message from conforming to a first transitioning protocol to conforming to a second transitioning protocol, and forward the message via the second network.