Transit Gateway DNS Resolution in Hub and Spoke VPC Networks
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Solution Overview
Problem
Virtual private clouds (VPCs) face challenges in communicating with each other and resolving domain name requests due to the lack of direct physical addresses and public network addressing schemes, leading to complexity in network management and inefficient peering processes.
Innovation Solution
A hub and spoke network topology is established using a transit gateway that allows multiple VPCs to be attached, enabling DNS resolution based on domain resolution rules propagated between VPCs, facilitating efficient communication and domain name resolution across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual private clouds use private network addressing schemes, then communication security between VPCs is improved, but domain name resolution capability deteriorates
Solution Approach 1:
The patent introduces a transit gateway as an intermediary component that mediates communication between multiple VPCs. The transit gateway receives DNS resolution requests from VPCs, resolves domain names to private IP addresses using propagated DNS resolution rules, and forwards packets between VPCs. This intermediary enables domain name resolution capability while maintaining private network addressing and communication security.
2Reliability
If traditional peering processes are used to connect VPCs, then direct communication between VPCs is improved, but network management complexity increases
Solution Approach 1:
The patent merges multiple VPCs into a unified network fabric through the transit gateway. Instead of establishing individual peering connections between each pair of VPCs, the transit gateway consolidates routing and DNS resolution functionality, allowing any VPC to communicate with any other VPC through the centralized gateway. This reduces network management complexity while maintaining direct communication capabilities.
Solution Approach 2:
The transit gateway serves multiple functions simultaneously: it acts as a routing gateway for packet forwarding between VPCs, a DNS resolution server for domain name to IP address translation, and a propagation mechanism for distributing DNS resolution rules across all attached VPCs. This multi-functionality simplifies network architecture compared to traditional one-to-one peering.
3Productivity
If DNS resolution rules are propagated to all VPCs, then DNS resolution efficiency is improved, but information security risks increase
Solution Approach 1:
The transit gateway acts as a secure intermediary that controls the propagation of DNS resolution rules to VPCs. It receives DNS resolution rules from authorized sources, validates them, and distributes them to attached VPCs through controlled mechanisms. This intermediary role enables efficient DNS resolution across VPCs while implementing security controls to mitigate information security risks.
Data Source
AI summary
Systems and methods are provided for domain name system (DNS) resolutions in a network environment that includes multiple virtual private clouds (VPCs) attached indirectly to each other via a transit gateway that serves as a hub in a hub and spoke model. An administrator of a VPC may specify rules for resolving DNS resolution requests at the given VPC, and the rules may be taken into account by DNS resolvers at other VPCs attached to the same transit gateway based on information propagated by the transit gateway.