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Posted On: Sep 11, 2019

You can now include additional metadata in Amazon Virtual Private Cloud (Amazon VPC) flow logs to better understand network flows. VPC flow logs enable you to capture information about the IP traffic going to and from network interfaces in your VPC. You can use VPC flow logs to troubleshoot network connectivity issues, monitor VPC traffic, and identify network threats.

Usage of additional metadata fields like vpc-id, subnet-id, Transmission Control Protocol (TCP) bitmask reduce the number of computations and look-ups required to extract meaningful information from the log data. For example, you can use TCP bitmask to identify the resource initiating at TCP connection. Similarly, you can use the packet source and destination IP fields to identify the source resource and the intended target of a connection passing through a network interface attached to NAT Gateway or an AWS Transit Gateway. To learn more about these new metadata fields refer our blog here.

You can deliver Amazon VPC flow logs to Amazon Simple Storage Service (S3) using the AWS Command Line Interface or Management Console. There is no extra cost to capture these additional metadata fields. For more information about VPC flow logs, please refer to the documentation here.

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