AWS Data Transfer

Hi, There are two options I recommend:

• If you can access to AWS Cost Explorer: Using AWS Cost Explorer to analyze data transfer costs ( https://aws.amazon.com/blogs/mt/using-aws-cost-explorer-to-analyze-data-transfer-costs/ )
• Another option: Using CUDOS Dashboard to better visualise data transfer charges ( https://wellarchitectedlabs.com/cost/200_labs/200_cloud_intelligence/#cudos-dashboard ). Thank you

Here is an example of CUDOS Dashboard: https://d1s0yx3p3y3rah.cloudfront.net/anonymous-embed?dashboard=cudos (you may want to select Data Transfer) Menu at the top.

You cannot deactive Data Transfer if you are using other services like EC2 or S3. Charges for Data Transfer is essentially charges for traffic that is being sent by your resources, for example, outside to the Internet, or to other AWS Regions, or between availability zones within the same AWS region. Check the links to resources provided in other answers, - you can use for example AWS Cost Explorer to investigate which services are generating data transfer charges: https://aws.amazon.com/blogs/mt/using-aws-cost-explorer-to-analyze-data-transfer-costs/

Also, check out this video training we've done a while ago that talks about different types of data transfer charges and how to investigate them using billing monitoring tools: https://www.youtube.com/watch?v=UjliYz25_qo

If you want to avoid data transfer charges, the best option is to watch out who is sending traffic to and from your AWS resources, and especially be careful with access and permissions. If your resources should not be accessing internet, make sure to set up the relevant security permissions; that way you would not see major traffic charges (unless, for example, you need your EC2 instances to ocasionally connect to the internet for patching; but for these purposes you could just stay within the Free Tier limits of data transfer charges).