Distributed NAT Edge Nodes Reduce Latency
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Solution Overview
Problem
Traditional network address translation (NAT) systems are inadequate for large, distributed network architectures, as they often rely on a single gateway and centralized control planes, leading to inefficiencies and increased latency, particularly in software-defined networking environments where client devices need continuous access to network services while roaming across different edge nodes.
Innovation Solution
Implementing a decentralized NAT service across edge nodes in a software-defined network fabric, where edge nodes register client devices with a control plane, record translations, and perform source and destination NAT on IP packets without requiring constant communication with the control plane, enabling continuous network access and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gateway is used to perform NAT services, then the device complexity is reduced and ease of operation is improved, but the productivity decreases and latency increases in large distributed networks
Solution Approach 1:
The patent divides the centralized NAT gateway into multiple distributed NAT service providers across different edge nodes in the network fabric. Each edge node maintains local NAT translation capabilities and translation tables, segmenting the monolithic NAT function into distributed units that can operate independently and simultaneously, thereby improving overall productivity while managing complexity through modular design.
2Device complexity
If a single gateway is used to perform NAT services, then the device complexity is reduced, but the loss of time increases due to centralized control plane communication requirements
Solution Approach 1:
The patent segments the centralized control plane into distributed control capabilities at each edge node. Each NAT service provider maintains local translation tables and can perform NAT operations autonomously without constant communication with a central controller, significantly reducing latency while the overall system structure remains manageable through standardized interfaces.
Solution Approach 2:
The patent implements preliminary action by pre-populating translation tables at each edge node with NAT mappings before traffic arrives. This allows immediate NAT translation operations without requiring real-time communication with the control plane, reducing operational latency while maintaining accurate address translations.
3Productivity
If NAT functionality is extended to distributed edge nodes, then the productivity is improved and latency is reduced, but the device complexity increases
Solution Approach 1:
The patent implements universality by designing edge nodes that can simultaneously perform multiple functions: acting as both NAT service providers and network fabric members. These edge nodes participate in both the data plane (performing NAT translations) and the control plane (maintaining translation tables, coordinating with other edge nodes), eliminating the need for separate dedicated NAT gateway devices and reducing overall system complexity despite the distributed architecture.
4Productivity
If decentralized NAT service is implemented across edge nodes, then the productivity is improved and latency is reduced, but the ease of operation decreases due to distributed management requirements
Solution Approach 1:
The patent implements feedback mechanisms where edge nodes continuously exchange information about their NAT translation tables and current operational state with neighboring edge nodes and the control plane. This feedback enables automatic coordination, conflict resolution, and load balancing across the distributed NAT services, simplifying management operations while maintaining high productivity through localized decision-making.
Data Source
AI summary
This disclosure describes techniques for implementing network address translation as a distributed service over the nodes of a logical network fabric, such as a software-defined network fabric. A method includes registering, by an edge node of a network, an IP address of a client device. The method further includes forwarding, by the edge node, the registered IP address to a control plane of the network. The method further includes checking, by the control plane, a network address translation policy. The method further includes recording, by the control plane, translations between the registered IP address and an allocated IP address in a translation table, each of the translations being related to the edge node. The method further includes returning, by the control plane, the translations between the registered IP address and the allocated IP address to the edge node.