Merge pull request #5 from redpanda-data/sarah/comment_cidr_ranges

Add comments explaining where the cidr blocks are coming from

Author: frenchfrywpepper

customer-managed/aws/terraform/security_groups.tf

@@ -64,12 +64,22 @@ resource "aws_security_group" "redpanda_node_group" {
 
 locals {
   rp_node_group_cidr_blocks = var.public_cluster ? [
+
+    // only used in the event that you want a public cluster, when the variable public_cluster is true
     "0.0.0.0/0"
+
     ] : [
+
+    // RFC 6598 reserved prefix for shared address space
+    // https://datatracker.ietf.org/doc/html/rfc6598
     "100.64.0.0/10",
+
+    // RFC 1918 reserved IP address space for private internets
+    // https://datatracker.ietf.org/doc/html/rfc1918
     "172.16.0.0/12",
     "192.168.0.0/16",
     "10.0.0.0/8",
+
   ]
 }
 resource "aws_security_group_rule" "redpanda_node_group" {