在VPC中可以在AWS上创建的最小子网是多少? [英] What is the smallest subnet one can create on AWS in the VPC?

问题描述

我想将可以在子网中运行的实例数限制为尽可能最小的实例数.结合使用IAM角色，我可以限制用户可以在我的AWS账户上创建多少实例(请参阅 https://forums.aws.amazon.com/thread.jspa?threadID=174503 要求4反映了我的动机).

I want to limit the number of instances that can run in a subnet to the smallest number of instances possible. This in combination with an IAM role will allow me to limit how many instances a user can create on my AWS account (see https://forums.aws.amazon.com/thread.jspa?threadID=174503 requirement #4 which reflects my motivations).

在VPC中可以在AWS上创建的最小子网是什么?IPv4 CIDR是什么?

What is the smallest subnet one can create on AWS in the VPC and what would the IPv4 CIDR be?

推荐答案

16个IP是VPC子网(/28网络掩码)的最小范围.

16 IPs is the smallest range for a VPC Subnet -- /28 netmask.

例如，您可以创建CIDR范围为10.0.0.0/26的VPC，该范围最多支持10.0.0.0-10.0.0.63范围内的64个IP.

For example, you could create a VPC with the CIDR range 10.0.0.0/26 which would support up to 64 IPs in the range of 10.0.0.0 - 10.0.0.63.

然后，您可以使用以下VPC CIDR范围创建4个子网，每个子网具有16个可用IP:

Then you could create 4 subnets, each with 16 available IPs using the following VPC CIDR ranges:

10.0.0.0/28   (10.0.0.0  - 10.0.0.15)
10.0.0.16/28  (10.0.0.16 - 10.0.0.31)
10.0.0.32/28  (10.0.0.32 - 10.0.0.47)
10.0.0.48/28  (10.0.0.48 - 10.0.0.63)

注意::请参阅下面@sqlbot的重要评论.并非所有范围内的16个实例都可以使用.

NOTE: See important comment below by @sqlbot. Not all 16 in range can be used for instances.

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