VPC/CIDR IPv4 issue

Hello, Good day. Just started learning how to write IAAC on Cloud Formation using my text editor and I noticed something I don't understand.

Scenario 1 : If i create a VPC with an IPv4 CIDR (10.0.1.0/16) it rejects on the AWS console as invalid.

Scenario 2 : But if i run it as IAAC (Cloud formation) on a connected text editor, it corrects the mistake and works but the error remains in the CFN template

why?

I have screenshots incase this is needed.

Thank you

주제

네트워킹 및 콘텐츠 전송 관리 및 거버넌스

태그

아마존 VPC AWS CloudFormation

언어

English

Ibukun

질문됨 2년 전328회 조회

1개 답변

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This is because CloudFormation corrects the VPC CIDR to its canonical form. See https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpc.html

CidrBlock The IPv4 network range for the VPC, in CIDR notation. For example, 10.0.0.0/16. We modify the specified CIDR block to its canonical form; for example, if you specify 100.68.0.18/18, we modify it to 100.68.0.0/18.

전문가

Matt-B

답변함 2년 전

전문가

Brettski-AWS

검토됨 2년 전

Ibukun
2년 전
This explains it quite well. Thank you very much.
rePost-User-0135346
2년 전
Hello, does anyone has a human-readable reply? The answer is unclear to dummies like me and the URL quoted is not working. What is wrong with 10.0.0.0/16? How should it be written???

VPC/CIDR IPv4 issue

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