CloudFormation で Subnet に IPv6 CIDR を設定する
Resources: Vpc: Type: AWS::EC2::VPC Properties: CidrBlock: 10.128.0.0/16 VpcCidrBlock: Type: AWS::EC2::VPCCidrBlock Properties: AmazonProvidedIpv6CidrBlock: true VpcId: !Ref Vpc Subnet: Type: AWS::EC2::Subnet Properties: CidrBlock: 10.128.0.0/24 Ipv6CidrBlock: !Select - 0 - !Cidr - !Select - 0 - !GetAtt Vpc.Ipv6CidrBlocks - 1 - 64 VpcId: !Ref Vpc