A Deep Dive into AWS Transit Gateway
LearnCantrill・11 minutes read
Transit Gateway is a hub and spoke architecture in AWS that connects various networking types, such as VPCs and on-premises networks, and can integrate indirectly with Direct Connect. It allows for peering with up to 50 other Transit Gateways, though static routes are required for communication, and unique ASNs are recommended for future enhancements.
Insights
- Transit Gateway in AWS acts as a centralized hub connecting VPCs, on-premises networks, and Direct Connect through VPC and VPN attachments, with the ability to peer with up to 50 other Transit Gateways for regional connectivity.
- To ensure seamless communication between Transit Gateways, static routes need to be configured as peering attachments do not automatically share routes, and unique ASNs are recommended for future enhancements. DNS resolution from public to private addresses is not supported over inter-region peering, and data transfer is encrypted over the AWS network.
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Recent questions
What is the purpose of Transit Gateway in AWS?
Transit Gateway serves as a hub and spoke architecture connecting various networking types within AWS, including VPCs and on-premises networks via VPN attachments.
How does Transit Gateway integrate with Direct Connect?
Transit Gateway integrates with Direct Connect through the creation of a transit VIF, allowing one DX Gateway to attach to three Transit Gateways for seamless connectivity.
How many Transit Gateways can be peered with each other?
Transit Gateways can be peered with up to 50 other Transit Gateways per Transit Gateway, enabling extensive connectivity across regions.
What is the default route table in Transit Gateway populated with?
The default route table in Transit Gateway is populated with routes learned from attachments, ensuring efficient routing within the network architecture.
Is public DNS resolution supported over inter-region peering attachments?
Public DNS resolution to private addressing is not supported over inter-region peering attachments in Transit Gateway, ensuring secure data transfer over the global AWS network.
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Summary
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AWS Transit Gateway: Connecting Networks Efficiently
- Transit Gateway is a hub and spoke architecture connecting various networking types within AWS.
- It can connect to VPCs using VPC attachments, on-premises networks via VPN attachments, and indirectly integrate with Direct Connect.
- A transit VIF is created for Direct Connect integration, allowing one DX Gateway to attach to three Transit Gateways.
- The Transit Gateway has a default route table populated with routes learned from attachments.
- Transit Gateways can be peered with up to 50 other Transit Gateways per Transit Gateway, enabling connectivity across regions.
- Peering attachments between Transit Gateways do not share routes; static routes must be configured for communication.
- AWS recommends using unique ASNs for Transit Gateways to prepare for future enhancements.
- Public DNS resolution to private addressing is not supported over inter-region peering attachments.
- Data transfer over peering attachments is encrypted over the global AWS network, similar to VPC peering.
