Create Subnet

Create Subnet

  1. In the VPC interface

  • Select Subnet

  • Select Create subnet

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  1. In the interface ** Create subnet **
  • Select On-Premise VPC

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  1. Perform subnet settings

  • Subnet name, enter ``` PublicSubnet-OnPremise**

  • Select AZ us-ease-1a

  • Ipv4 CIDR block , enter 10.12.1.0/24

  • Scroll down and click Create subnet*

subnet 4. Complete creating subnet

  1. Do the same to create additional subnets
  • PrivateSubnet1-Consumer belongs to Consumer VPC with CIDR of 10.11.1.0/24 located in Availability Zone us-east-1a

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  • PrivateSubnet2-Consumer belongs to Consumer VPC with CIDR of 10.11.2.0/24 located in Availability Zone us-east-1b

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  • PrivateSubnet1-Provider belongs to Provider VPC with CIDR of 10.10.1.0/24 located in Availability Zone us-east-1a

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  • PrivateSubnet2-Provider belongs to Provider VPC with CIDR of 10.10.2.0/24 located in Availability Zone us-east-1b

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  • PublicSubnet-Provider belongs to Provider VPC with CIDR of 10.10.3.0/24 located in Availability Zone us-east-1a

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You can see there are 2 columns, Availability Zone and Availability Zone ID. To avoid EC2 resources being used unevenly, (we often tend to use AZ a to run primary and AZ b to stand by, for example), AWS will randomly assign Availability Zone to ** Availability Zone ID**. We can understand that Availability Zone is a form of alias, and Availability Zone ID is the identifier. For example, in the image above Availability Zone ap-southeast-1a is assigned Availability Zone ID as apse1-az2. In another AWS account, Availability Zone ap-southeast-1a might have an Availability Zone ID of apse1-az1.

Enable Enable auto-assign public IPv4 address for Public subnets

  • Select PublicSubnet-OnPremise , select Actions, select Edit subnet settings

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  • Select Enable auto-assign public IPv4 address

  • Click Save

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The same is done with PublicSubnet-Provider

  • Select PublicSubnet-OnPremise , select Actions, select Edit subnet settings

  • Select Enable auto-assign public IPv4 address

  • Click Save

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Another notable point is that the subnets are basically the same. Through route table configuration and public IP address allocation, we can divide them into Public and Private Subnets.