Networking in AWS Control Tower - AWS Control Tower

Networking in AWS Control Tower

AWS Control Tower provides basic support for networking through VPCs.

If the default configuration or capabilities of the AWS Control Tower VPC do not meet your needs, you can use other AWS services to configure your VPC. For more information about how to work with VPCs and AWS Control Tower, see Building a Scalable and Secure Multi-VPC AWS Network Infrastructure.

Related topics
  • For information about how AWS Control Tower works when you enroll accounts that have existing VPCs, see Enrolling existing accounts with VPCs.

  • With Account Factory, you can provision accounts that include an AWS Control Tower VPC, or you can provision accounts without a VPC. For information about how to delete the AWS Control Tower VPC or configure AWS Control Tower accounts without a VPC, see Walkthrough: Configure AWS Control Tower Without a VPC.

  • For information about how to change account settings for VPCs, see the Account Factory documentation on updating an account.

  • For more information about working with networking and VPCs in AWS Control Tower, see the section about Networking on the Related information page of this User Guide.

VPCs and AWS Regions in AWS Control Tower

As a standard part of account creation, AWS creates an AWS-default VPC in every Region, even the Regions you are not governing with AWS Control Tower. This default VPC is not the same as a VPC that AWS Control Tower creates for a provisioned account, but the AWS default VPC in a non-governed Region may be accessible to IAM users.

Adminstrators can enable the Region deny control, so that your end-users do not have permission to connect to a VPC in a Region that's supported by AWS Control Tower but outside your governed Regions. To configure the Region deny control, go to the Landing zone settings page and select Modify settings.

The Region deny control blocks API calls to most services in non-governed Regions. For more information, see Deny access to AWS based on the requested AWS Region.

Note

The Region deny control may not prevent IAM users from connecting to an AWS default VPC in a Region where AWS Control Tower is not supported.

Optionally, you can remove the AWS default VPCs in non-governed Regions. To list the default VPC in a Region you can use a CLI command similar to this example:

aws ec2 --region us-west-1 describe-vpcs --filter Name=isDefault,Values=true