Global Accelerator and Route 53: DNS Strategies for Multi-Region Architectures

The Latency Problem

A server in Frankfurt reaches users in Germany in ~10 ms. Users in Singapore wait 250 ms. For interactive applications, this is the difference between "fast" and "noticeably slow."

Route 53 Routing Strategies

• Latency-Based Routing: Route 53 automatically directs users to the region with the lowest latency. No manual geo-mapping required.
• Failover Routing: Primary/secondary setup with health checks — automatic failover during outages.
• Weighted Routing: Split traffic by percentage — ideal for gradual migrations and canary deployments.
• Geolocation Routing: Route traffic based on geographic origin — for compliance (keeping data in the EU).

AWS Global Accelerator

Global Accelerator goes one step further than DNS routing:

• Anycast IPs: Two static IP addresses that are routed globally through the AWS backbone network.
• No DNS Caching Problem: Unlike DNS-based routing, there are no TTL delays during failover.
• TCP/UDP Optimization: Traffic is routed through the AWS internal network instead of the public internet — fewer hops, less packet loss.

When to Use What?

Route 53 latency-based routing for most multi-region setups. Global Accelerator when you need static IPs, require instant failover (<30 seconds), or want to optimize TCP performance over long distances.