{"id":"cfn-vpc-ipv6-requires-separate-cidr-resource","text":"IPv6 is not a direct property of `AWS::EC2::VPC` — it requires a separate `AWS::EC2::VPCCidrBlock` resource with `AmazonProvidedIpv6CidrBlock: true`.","truth_value":"IN","source":"entries/2026/03/11/AWSCloudFormation-latest-UserGuide-aws-resource-ec2-vpchtml.md","source_url":"","source_hash":"a2ee1634d69ad9c2","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"cfn-vpc-ipv6-requires-separate-cidr-resource","truth_value":"IN","reason":"premise"}]}}