diff --git a/README.md b/README.md
index 7ffc816..6f684ef 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,15 @@ should align to these tenets, or propose an adjustment to the tenets.
- Azure Reserved - DNS Mapping
- Broadcast Address (last network address)
+### GCP mode ([docs](https://cloud.google.com/vpc/docs/subnets#unusable-ip-addresses-in-every-subnet)):
+
+- Smallest subnet: /29
+- Four reserved addresses per subnet:
+ - Network Address (network + 0)
+ - GCP Reserved - Default Gateway (network + 1)
+ - GCP Reserved - Future Use (second-to-last address)
+ - Broadcast Address (last network address)
+
### OCI mode ([docs](https://docs.oracle.com/en-us/iaas/Content/Network/Concepts/overview.htm#Reserved__reserved_subnet)):
- Smallest subnet: /30
diff --git a/dist/index.html b/dist/index.html
index 401293e..fdde4a0 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -107,6 +107,7 @@ Visual Subnet Calculator
Mode - Standard
Mode - AWS
Mode - Azure
+ Mode - GCP
Mode - OCI
Import / Export
diff --git a/dist/js/main.js b/dist/js/main.js
index d4b96a5..f913963 100644
--- a/dist/js/main.js
+++ b/dist/js/main.js
@@ -29,6 +29,13 @@ let infoColumnCount = 5
// - Net+0 = Network Address
// - Net+1 = OCI Reserved - Default Gateway Address
// - Last = Broadcast Address
+// GCP mode:
+// - Smallest subnet: /29
+// - Four reserved addresses per subnet:
+// - Net+0 = Network Address
+// - Net+1 = GCP Reserved - Default Gateway
+// - Net+Last-1 = GCP Reserved - Future Use
+// - Last = Broadcast Address
let noteTimeout;
let operatingMode = 'Standard'
let previousOperatingMode = 'Standard'
@@ -40,6 +47,7 @@ const netsizePatterns = {
Standard: '^([12]?[0-9]|3[0-2])$',
AZURE: '^([12]?[0-9])$',
AWS: '^(1?[0-9]|2[0-8])$',
+ GCP: '^([12]?[0-9])$',
OCI: '^([12]?[0-9]|30)$',
};
@@ -47,6 +55,7 @@ const minSubnetSizes = {
Standard: 32,
AZURE: 29,
AWS: 28,
+ GCP: 29,
OCI: 30,
};
@@ -131,6 +140,16 @@ $('#dropdown_aws').click(function() {
}
});
+$('#dropdown_gcp').click(function() {
+ previousOperatingMode = operatingMode;
+ operatingMode = 'GCP';
+
+ if(!switchMode(operatingMode)) {
+ operatingMode = previousOperatingMode;
+ $('#dropdown_'+ operatingMode.toLowerCase()).addClass('active');
+ }
+});
+
$('#dropdown_oci').click(function() {
previousOperatingMode = operatingMode;
operatingMode = 'OCI';
@@ -279,7 +298,7 @@ function addRow(network, netSize, colspan, note, notesWidth, color, operatingMod
let addressFirst = ip2int(network)
let addressLast = subnet_last_address(addressFirst, netSize)
let usableFirst = subnet_usable_first(addressFirst, netSize, operatingMode)
- let usableLast = subnet_usable_last(addressFirst, netSize)
+ let usableLast = subnet_usable_last(addressFirst, netSize, operatingMode)
let hostCount = 1 + usableLast - usableFirst
let styleTag = ''
if (color !== '') {
@@ -432,14 +451,17 @@ function subnet_usable_first(network, netSize, operatingMode) {
// AWS reserves 3 additional IPs
// https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#are-there-any-restrictions-on-using-ip-addresses-within-these-subnets
// Azure reserves 3 additional IPs
+ // https://cloud.google.com/vpc/docs/subnets
+ // GCP reserves 2 additional IPs at the start
// https://docs.oracle.com/en-us/iaas/Content/Network/Concepts/overview.htm#Reserved__reserved_subnet
- // OCI reserves 2 additional IPs
+ // OCI reserves 1 additional IP
//return network + (operatingMode == 'Standard' ? 1 : 4);
switch (operatingMode) {
case 'AWS':
case 'AZURE':
return network + 4;
break;
+ case 'GCP':
case 'OCI':
return network + 2;
break;
@@ -452,10 +474,15 @@ function subnet_usable_first(network, netSize, operatingMode) {
}
}
-function subnet_usable_last(network, netSize) {
+function subnet_usable_last(network, netSize, operatingMode) {
let last_address = subnet_last_address(network, netSize);
if (netSize < 31) {
- return last_address - 1;
+ // GCP reserves the last 2 addresses (second-to-last and broadcast)
+ if (operatingMode === 'GCP') {
+ return last_address - 2;
+ } else {
+ return last_address - 1;
+ }
} else {
return last_address;
}
@@ -618,6 +645,9 @@ function mutate_subnet_map(verb, network, subnetTree, propValue = '') {
case 'AZURE':
var modal_error_message = 'The minimum IPv4 subnet size for Azure is /' + minSubnetSizes[operatingMode] + '.
More Information:
Azure Virtual Network FAQ > How small and how large can virtual networks and subnets be?'
break;
+ case 'GCP':
+ var modal_error_message = 'The minimum IPv4 subnet size for GCP is /' + minSubnetSizes[operatingMode] + '.
More Information:
Google Cloud VPC > Subnets > Unusable addresses in IPv4 subnet ranges'
+ break;
case 'OCI':
var modal_error_message = 'The minimum IPv4 subnet size for OCI is /' + minSubnetSizes[operatingMode] + '.
More Information:
Infrastructure Services>Networking>Networking Overview>Three IP Addresses in Each Subnet'
break;
@@ -669,6 +699,9 @@ function switchMode(operatingMode) {
case 'AZURE':
var validate_error_message = 'Azure Mode - Smallest size is /' + minSubnetSizes[operatingMode]
break;
+ case 'GCP':
+ var validate_error_message = 'GCP Mode - Smallest size is /' + minSubnetSizes[operatingMode]
+ break;
case 'OCI':
var validate_error_message = 'OCI Mode - Smallest size is /' + minSubnetSizes[operatingMode]
break;
@@ -688,7 +721,7 @@ function switchMode(operatingMode) {
}
});
// Remove active class from all buttons if needed
- $('#dropdown_standard, #dropdown_azure, #dropdown_aws, #dropdown_oci').removeClass('active');
+ $('#dropdown_standard, #dropdown_azure, #dropdown_aws, #dropdown_gcp, #dropdown_oci').removeClass('active');
$('#dropdown_' + operatingMode.toLowerCase()).addClass('active');
isSwitched = true;
} else {
@@ -699,6 +732,9 @@ function switchMode(operatingMode) {
case 'AZURE':
var modal_error_message = 'One or more subnets are smaller than the minimum allowed for Azure.
The smallest size allowed is /' + minSubnetSizes[operatingMode] + '.
See: Azure Virtual Network FAQ > How small and how large can virtual networks and subnets be?'
break;
+ case 'GCP':
+ var modal_error_message = 'One or more subnets are smaller than the minimum allowed for GCP.
The smallest size allowed is /' + minSubnetSizes[operatingMode] + '.
See: Google Cloud VPC > Subnets > Unusable addresses in IPv4 subnet ranges'
+ break;
case 'OCI':
var modal_error_message = 'One or more subnets are smaller than the minimum allowed for OCI.
The smallest size allowed is /' + minSubnetSizes[operatingMode] + '.
See: Infrastructure Services>Networking>Networking Overview>Three IP Addresses in Each Subnet'
break;
@@ -747,6 +783,9 @@ function set_usable_ips_title(operatingMode) {
case 'AZURE':
$('#useableHeader').html('Usable IPs (Azure)')
break;
+ case 'GCP':
+ $('#useableHeader').html('Usable IPs (GCP)')
+ break;
case 'OCI':
$('#useableHeader').html('Usable IPs (OCI)')
break;