CIDR 意外添加了另一个 AWS VPC

Question

I have accidently added a secondary CIDR to a VPC which was already being used by another VPC in another AWS account our company's private.network. My question here is if the cidr was already being used, how was I allowed to add again to another VPC? Also doesn't AWS provide a mechanism to check if the cidr range that we are trying to add is available or being used?

Answer 1

You can have multiple VPCs with the same CIDR range. This is the benefit of the Cloud. It's great when you want non-production.networks to exactly match Production.networks, It's a feature. not a failure.

Having multiple VPCs with overlapping ranges will only be an inconvenience if you wish to connect those VPCs together, or you wish to be able to route to both VPCs from the same VPN or Direct Connect connection.