So basically, if you are requesting S3 bucket data cross-region you can't use an S3 endpoint and the data will traverse the Internet unless you have some sort of end to end private line. Just in case anybody was wondering. http://websitenotebook.blogspot.com/2017/06/where-does-traffic-flow-for-aws-s3.html …
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So about 6/17 I documented what AWS support told me: "In-region S3 traffic to an S3 endpoint never traverses the public Internet. If you access a bucket in a different region, that will traverse the Internet." Has this changed or did they give me wrong info?
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That traffic has stayed on the AWS backbone for quite a while, but with the option to fail over to the Internet transit if two or three plus links fail. In our customer messaging we’ve given the most under promise, over deliver kind of answer ...
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Also the docs indicate you cannot use S3 endpoint cross region, unless that has changed. So even if it stays w/in AWS can't keep it restricted to your own network when going cross region per the docs (as I understand them, feel free to correct).
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Endpoints can’t span regions today, but you can lock down buckets to your EIPs with IAM policy as a workaround.
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