AWS Multi-Account Networking

As you scale your cloud infrastructure, managing networking across multiple AWS accounts can become increasingly complex. AWS offers a simple solution for this challenge: AWS Transit Gateway (TGW). When enhanced with centralised Ingress and Egress VPCs, this becomes even more powerful. This architecture simplifies network management, enhances security, and optimises traffic flow across multiple AWS accounts.

Why Use AWS Transit Gateway?

AWS Transit Gateway is a high-performance service that connects VPCs and on-premises networks through a central hub. Here are some key benefits:

1. Simplified Network Management: TGW reduces the complexity of VPC peering connections by providing a single point of control.
2. Scalability: Easily connect thousands of VPCs and on-premises networks without managing numerous peering connections.
3. Improved Security: Centralised control over traffic routing and security policies.
4. Cost Efficiency: Reduce data transfer costs between VPCs and simplify billing.

Centralised Ingress and Egress VPCs

A centralised Ingress VPC handles incoming traffic from external sources, whilst a centralised Egress VPC manages outbound traffic to the internet. This setup provides several advantages:

1. Enhanced Security: Centralised VPCs allow you to enforce consistent security policies, such as WAFs, Firewalls and NAT Gateways.
2. Streamlined Monitoring: Easier to monitor and audit traffic flow through centralised points.
3. Simplified Management: Consolidate management tasks like IP allowlisting and traffic filtering.