code:
cidrsubnet("10.1.2.0/21", 3, 8)
question from:https://stackoverflow.com/questions/65838425/when-i-run-cidrsubnet-function-in-terraform-i-am-getting-prefix-extension-of-3code:
cidrsubnet("10.1.2.0/21", 3, 8)
question from:https://stackoverflow.com/questions/65838425/when-i-run-cidrsubnet-function-in-terraform-i-am-getting-prefix-extension-of-3When you are using cidrsubnet("10.1.2.0/21", 3, 8)
, you are adding 3 bits. Since in binary 2 ^ 3 = 8
, you can define maximally 8 subnets in this range: 0,1,2,..., 7 with the following cidrs:
If you want to define subnets between 0 and 15, you have to use: cidrsubnet("10.1.2.0/21", 4, 8)
, since 2 ^ 4 = 16
and you can have sixteen subnets: 0, 1, 2, ..., 15.