Add additional comments to scripts

Author: shaun-nx

tests/scripts/create-and-setup-gcp-vm.sh

@@ -13,9 +13,10 @@ NETWORK_TIER="network-tier=PREMIUM"
 source scripts/vars.env
 
 # Create custom network and subnet if IPv6 is enabled
+# For IPv6, we create a dual-stack subnet with internal IPv6 addresses and external IPv4 addresses
 if [ "${IPV6_ENABLED}" = "true" ]; then
     echo "Creating IPv6 Network interface for the GKE cluster"
-    gcloud compute networks create ${RESOURCE_NAME} --subnet-mode=custom --bgp-routing-mode=regional --mtu=1460 --quiet
+    gcloud compute networks create ${RESOURCE_NAME} --subnet-mode=custom --quiet # The --subnet-mode=custom flag allows us to create custom subnets
     gcloud compute networks subnets create ${RESOURCE_NAME} \
         --network=${RESOURCE_NAME} \
         --stack-type=IPV4_IPV6 \