HCPE-1198: add CIDR guidance to HVN resource documentation #160
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| - The default HVN CIDR block value does not overlap with the default CIDR block value for AWS VPCs (172.31.0.0/16). However, if you are planning to use this HVN in production, we recommend adding a custom value instead of using the default. | ||
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| - The CIDR block value must end between /16 and /25. |
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One other thing since we're adding some more guidance here (although definitely not blocking): I believe our APIs expect CIDR blocks to use the first IP address in the block, and will error if an arbitrary IP address within the block is used (and I think cidrsubnet() can help with this?). We could potentially add something to help guide users past that restriction.
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Oh I didn't know that.💡 I'll run this by control plane team:
The CIDR block value should be the first IP address of the desired CIDR block. The [cidrsubnet()](https://www.terraform.io/docs/language/functions/cidrsubnet.html) helper can be used to specify the first address.
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Got 👍 from control plane. Went ahead and added a couple more rules that we're enforcing on the backend.
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🛠️ Description
Adds some helpful guidance around HVN CIDR blocks, like we offer in the UI.