Cross-region data transfer with Transit Gateway: Simplify your network
VPC peering scales badly. 10 VPCs = 45 peering connections. 20 VPCs = 190 connections. Transit Gateway is one hub. All VPCs connect to it.
How it works
Create Transit Gateway. Attach VPCs. Configure routes. Traffic flows through the gateway, not direct peering.
Simplifies routing. Reduces peering overhead. Easier to manage.
Cross-region routing
Transit Gateway can peer across regions. London gateway connects to Frankfurt gateway. VPCs in London can reach VPCs in Frankfurt.
Data transfer still costs (£0.02/GB cross-region), but routing is cleaner.
Costs
Transit Gateway attachment: £0.05/hour per attachment (roughly £36/month per VPC).
Data transfer: £0.02/GB cross-region, £0.01/GB cross-AZ.
More expensive than direct peering, but worth it at 10+ VPCs.
Use cases
Multiple environments (prod, staging, dev) in different regions.
On-prem connectivity to AWS (replace VPN).
Multi-tenancy (separate VPCs, shared Transit Gateway).
Where Critical Cloud comes in
Transit Gateway hides complexity. Understanding data flow requires deep network knowledge. We monitor traffic through your gateway. You see where data moves.