diff --git a/pkg/harvester/edit/kubeovn.io.subnet/index.vue b/pkg/harvester/edit/kubeovn.io.subnet/index.vue
index d648e8e3..3ad6246c 100644
--- a/pkg/harvester/edit/kubeovn.io.subnet/index.vue
+++ b/pkg/harvester/edit/kubeovn.io.subnet/index.vue
@@ -43,18 +43,20 @@ export default {
   created() {
     const vpc = this.$route.query.vpc || '';
     const enableDHCP = this.value?.spec?.enableDHCP || false;
+    const natOutgoing = this.value?.spec?.natOutgoing || false;
 
     set(this.value.spec, 'enableDHCP', enableDHCP);
     set(this.value, 'spec', this.value.spec || {
-      cidrBlock:  '',
-      protocol:   NETWORK_PROTOCOL.IPv4,
-      provider:   '',
+      cidrBlock:    '',
+      protocol:     NETWORK_PROTOCOL.IPv4,
+      provider:     '',
       vpc,
-      gatewayIP:  '',
-      excludeIps: [],
-      private:    false,
+      gateway:      '',
+      excludeIps:   [],
+      private:      false,
       enableDHCP,
-      acls:       []
+      natOutgoing,
+      acls:         []
     });
   },
 
@@ -129,6 +131,10 @@ export default {
         label: n.id,
         value: n.id,
       }));
+    },
+    natOutgoingDisabled() {
+      // Disable the NAT Outgoing option when the subnet belongs to the ovn-cluster VPC and its name is join or ovn-default.
+      return this.value?.spec?.vpc === 'ovn-cluster' && ['join', 'ovn-default'].includes(this.value?.metadata?.name);
     }
   },
 
@@ -304,6 +310,20 @@ export default {
             </Banner>
           </div>
         </div>
+        <div class="row mt-20">
+          <div class="col span-6">
+            <RadioGroup
+              v-model:value="value.spec.natOutgoing"
+              name="enableExternalConnectivity"
+              :disabled="natOutgoingDisabled"
+              :options="[true, false]"
+              :label="t('harvester.subnet.externalConnectivity.label')"
+              :labels="[t('generic.enabled'), t('generic.disabled')]"
+              :mode="mode"
+              :tooltip="t('harvester.subnet.externalConnectivity.tooltip')"
+            />
+          </div>
+        </div>
         <div class="row mt-20">
           <div class="col span-6">
             <RadioGroup
diff --git a/pkg/harvester/l10n/en-us.yaml b/pkg/harvester/l10n/en-us.yaml
index bffbe88c..04fe4d30 100644
--- a/pkg/harvester/l10n/en-us.yaml
+++ b/pkg/harvester/l10n/en-us.yaml
@@ -1156,6 +1156,9 @@ harvester:
       placeholder: key1=value1, key2=value2
       dhcpOptionBanner: DHCP options is a key/value string concatenate with comma. For more detail, please refer to <a href="https://kubeovn.github.io/docs/v1.13.x/en/kubevirt/dhcp/" target="_blank">KubOVN document</a>
       tooltip: Enable DHCP server for this subnet. When enabled, VMs can automatically obtain IP addresses from this subnet.
+    externalConnectivity:
+      label: NAT Outgoing
+      tooltip: Enable NAT for VMs using this subnet to access external networks.
     private:
       label: Private Subnet
       tooltip: Enable network isolation for this Subnet. When enabled, VMs can only communicate within this subnet, even if other subnets exist under the same VPC.