SDNAT Proxy for VM External Access Without Direct Connectivity
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Solution Overview
Problem
Current network address translation (NAT) technologies do not support external access for virtual machine (VM) components that do not have Internet access, limiting maintenance and communication capabilities.
Innovation Solution
A source-destination network address translation (SDNAT) proxy system that translates both source and destination IP addresses to enable communication between VMs and external networks, allowing VMs to access the Internet without direct external connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional NAT is used to allow external access to VMs, then external network accessibility is improved, but network security and internal configuration integrity deteriorate
Solution Approach 1:
The SDNAT proxy acts as an intermediary between external networks and VMs, translating source and destination addresses in packets. This mediator enables external access while protecting internal VMs from direct exposure to external networks, thus resolving the contradiction between accessibility and security.
2Ease of repair
If direct external connectivity is provided to VM components, then maintenance capability is improved, but network isolation and security configuration deteriorate
Solution Approach 1:
The SDNAT proxy serves as a mediator that enables maintenance access to VMs without breaking network isolation. By translating addresses at the proxy level, external maintenance tools can communicate with VMs while the VMs remain isolated from direct external connectivity, preserving the stable network configuration.
3Adaptability or versatility
If all VM components are given Internet access, then external communication capability is improved, but security exposure and attack surface deteriorate
Solution Approach 1:
The SDNAT proxy applies different address translation rules to different VM components based on their specific access requirements. This local quality approach allows selected VMs to have external communication capability through the proxy while maintaining security by not exposing all VM components equally, thus reducing the overall attack surface.
Data Source
AI summary
A proxy and method for performing source destination network address translation are presented. The method includes receiving a first message from a node communicatively connected to a first network to access a resource communicatively connected to a second network, wherein the first message contains at least a source address and a destination address used within the first network; translating the destination address designated in the first message to an address of the resource; generating a unique address for the destination address designated in the first message, wherein the unique address is an address not in use on the second network; providing a translated message including the translated destination address and the unique address; and forwarding the translated message to the resource communicatively connected to the second network.