AWS::EC2::VPCCidrBlock

• Associates a CIDR block with your VPC

Properties

• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpccidrblock.html

Type: AWS::EC2::VPCCidrBlock
Properties:
  AmazonProvidedIpv6CidrBlock: Boolean
  CidrBlock: String
  Ipv4IpamPoolId: String
  Ipv4NetmaskLength: Integer
  Ipv6CidrBlock: String
  Ipv6IpamPoolId: String
  Ipv6NetmaskLength: Integer
  Ipv6Pool: String
  VpcId: String

Ipv6CidrBlock

• xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx (8 times - Each x is hexadecimal)

• You can only associate a single IPv6 CIDR block with your VPC

• Each IPv6 address only public (no private range)

• Even with IPv4, IPv6 cannot be disabled
• Auto assign IPv6 can be enabled
• The IPv6 CIDR block size is fixed at /56