Optimize EC2 -> S3 performance/cost [closed]

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According to the EC2 documentation, its more cost-effective to use the internal address to communicate between EC2 instances. What is the optimal way to communicate between EC2 and S3? Is there a notion of an "internal 开发者_开发问答address" for S3 and is it any faster/more cost effective than fetching from public address?

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http://aws.amazon.com/ec2/:

There is no Data Transfer charge between Amazon EC2 and other Amazon Web Services within the same region (i.e. between Amazon EC2 US West and Amazon S3 in US West)

http://aws.amazon.com/s3/:

There is no Data Transfer charge for data transferred between Amazon EC2 and Amazon S3 within the same Region or for data transferred between the Amazon EC2 Northern Virginia Region and the Amazon S3 US Standard Region.

so there is no need for a separate internal address.