Distributed Network Address Translation for Virtual Machine Scalability
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Solution Overview
Problem
Centralized Network Address Translation (NAT) devices in data centers can be a single point of failure and struggle to manage a large number of communication connections, limiting the scalability of virtual machine networks due to a finite set of externally accessible network addresses.
Innovation Solution
Implementing a distributed network and port address translation management system that uses edge computing devices to correlate internal network addresses with externally accessible addresses and port identifiers, allowing multiple virtual machine instances to share a common IP address while being distinguished by unique port addresses, thereby eliminating the need for a centralized translation component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized NAT device is used to translate network addresses, then address translation functionality is provided, but the system becomes a single point of failure and cannot scale to handle large numbers of connections
Solution Approach 1:
The patent divides the centralized NAT functionality into distributed NAT components across multiple host computing devices. Each host device independently performs address translation for its local virtual machines, eliminating the single point of failure and enabling horizontal scaling of the system to handle larger numbers of connections.
2Productivity
If a finite set of external network addresses is allocated to virtual machines, then network address translation is enabled, but the scalability of the virtual machine network is limited
Solution Approach 1:
The patent introduces port address identifiers as an additional dimension to distinguish virtual machines that share the same external network address. By combining external addresses with port identifiers, the system can support a much larger number of virtual machines without requiring a proportional increase in external IP addresses, thereby improving network scalability.
3Adaptability or versatility
If multiple virtual machines share a common IP address using port address identifiers, then address efficiency is improved, but the complexity of address management increases
Solution Approach 1:
The patent enables host computing devices to autonomously manage the correlation between internal network addresses, external network addresses, and port address identifiers through local data structures. This distributed self-management approach reduces the operational complexity compared to centralized management while maintaining flexible address allocation capabilities.
Data Source
AI summary
Systems and methods are disclosed that facilitate the management of network address information utilized by hosted computing devices. Each host computing device includes a local network and port address management component that is configured with port address translation information for the specific host computing device. Additionally, one or more edge computing devices also include a local network and port address management component that is configured with network and port address translation information. The network and port address translation information facilitates the correlation of internal network address information associated with a virtual machine instance with a tuple of an externally accessible network address and port address information. The local network and port address translation management components utilize the network and port address translation information to translate communication requests to and from the virtual machine instances without requiring a centralized network and port address translation component.