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VPC endpoint interface for s3/DynamoDB

What I have found in this document mentions VPC gateway are free of charge interface type charges by hour of usage.

(https://docs.aws.amazon.com/vpc/latest/privatelink/vpc-endpoints.html)

Also I know gateway only supports S3 and DynamoDB and interface supports many services. My question is if gateway is free of charge for S3/DynamoDB, why anyone wants to use interface type ?  Is there any other reason ? 

1 Answers

There are a number of specific use cases and functionalities that a VPC interface endpoint offers over a free gateway endpoint. One example is that Gateway does not allow access from on prem or from other AWS regions. 

https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html#types-of-vpc-endpoints-for-s3

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