How can I reduce data transfer charges for my NAT gateway?

Last updated: 2019-07-29

Resolution

First, determine the major sources of traffic through your NAT gateway. Then, consider the following strategies for reducing data transfer and processing charges.

  • Determine whether the instances sending the most traffic are in the same Availability Zone as the NAT gateway. If they're not, create new NAT gateways in the same Availability Zone as the resource to reduce cross-AZ data transfer charges.
  • Determine whether the majority of your NAT gateway charges are from traffic to Amazon Simple Storage Service or Amazon DynamoDB in the same Region. If they are, set up a gateway VPC endpoint. Route traffic to and from the AWS resource through the gateway VPC endpoint, rather than through the NAT gateway. There's no data processing or hourly charges for using gateway VPC endpoints.
  • If most traffic through your NAT gateway is to AWS services that support interface VPC endpoints, then create an interface VPC endpoint for the services. See pricing details for interface VPC endpoints to determine the potential cost savings.

Note: You can set up alarms to monitor use of your NAT gateway in the future using Amazon CloudWatch.


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