Amazon Cloud Developers

Feb 9, 2026 · Cloud Computing

How a NAT Gateway Fixes Asymmetric Routing for UDP in AWS Architectures

Using Amazon Global Accelerator, NLB, and Direct Connect can cause asymmetric routing that blocks UDP traffic, but adding a NAT gateway and adjusting route tables creates symmetric paths, restores bidirectional UDP communication, and scales with multi‑IP support, albeit with added cost.