EUC1-DataTransfer-Regional-Bytes : how to diagnose the source?

Question

As I can understand in the [documentation](https://docs.aws.amazon.com/cur/latest/userguide/cur-data-transfers-charges.html),
> Data transfer between Availability Zones in the same AWS Region have a UsageType of Region-DataTransfer-Regional-Bytes. For example, the USE2-DataTransfer-Regional-Bytes usage type identifies charges for data transfer between Availability Zones in the US East (Ohio) Region.

Since 2 days I go 4-5 $/day of `EUC1-DataTransfer-Regional-Bytes` that I never found so 'high' in the past. It was under 0.5 or entirely zero (`-` in cost explorer, litterally absent!)

How can I investigate and diagnose more?

Answer

Hello,

EUC1-DataTransfer-Regional-Bytes identifies charges for data transfer between Availability Zones in the eu-central-1(Frankfurt) Region.

Do you have any workloads deployed to this region?

You can analyse using Cost explorer to do basic analyse which service incurs data transfer costs. Here is the article, https://aws.amazon.com/blogs/mt/using-aws-cost-explorer-to-analyze-data-transfer-costs/

To do more in depth analyses, you can enable VPC flow logs and query using Amazon Athena. This article shows you how you can do it: https://repost.aws/knowledge-center/vpc-find-traffic-contributors

EUC1-DataTransfer-Regional-Bytes : how to diagnose the source?

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