Tuesday, July 13, 2021

AWS VPC CIDR Range Help

Hi. I need to create a subnet on AWS for some new servers but I need some advice about the IP plan as I'm confusing myself. Our on-prem sites use the range 10.0.0.0/8 globally (10.10.0.0/16 for office A; 10.20.0.0/16 for office B, etc). I want to be able to add a subnet on AWS with the range 10.10.240.0/24 but I don't know how to set this up without clashing with the on-prem range.

For the VPC I cannot use 10.0.0.0/8 as the CIDR range as it's taken. What's the most efficient way of doing this for the VPC and subnet IP range? Thanks in advance!



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