2 files changed, 18 insertions, 0 deletions
diff --git a/src/conf_mode/service_dhcp-server.py b/src/conf_mode/service_dhcp-server.py
index ceaba019e..2418c8faa 100755
--- a/src/conf_mode/service_dhcp-server.py
+++ b/src/conf_mode/service_dhcp-server.py
@@ -165,6 +165,7 @@ def verify(dhcp):
     shared_networks =  len(dhcp['shared_network_name'])
     disabled_shared_networks = 0
 
+    subnet_ids = []
 
     # A shared-network requires a subnet definition
     for network, network_config in dhcp['shared_network_name'].items():
@@ -176,6 +177,14 @@ def verify(dhcp):
                               'lease subnet must be configured.')
 
         for subnet, subnet_config in network_config['subnet'].items():
+            if 'subnet_id' not in subnet_config:
+                raise ConfigError(f'Unique subnet ID not specified for subnet "{subnet}"')
+
+            if subnet_config['subnet_id'] in subnet_ids:
+                raise ConfigError(f'Subnet ID for subnet "{subnet}" is not unique')
+
+            subnet_ids.append(subnet_config['subnet_id'])
+
             # All delivered static routes require a next-hop to be set
             if 'static_route' in subnet_config:
                 for route, route_option in subnet_config['static_route'].items():
diff --git a/src/conf_mode/service_dhcpv6-server.py b/src/conf_mode/service_dhcpv6-server.py
index 9cc57dbcf..7cd801cdd 100755
--- a/src/conf_mode/service_dhcpv6-server.py
+++ b/src/conf_mode/service_dhcpv6-server.py
@@ -63,6 +63,7 @@ def verify(dhcpv6):
 
     # Inspect shared-network/subnet
     subnets = []
+    subnet_ids = []
     listen_ok = False
     for network, network_config in dhcpv6['shared_network_name'].items():
         # A shared-network requires a subnet definition
@@ -72,6 +73,14 @@ def verify(dhcpv6):
                               'each shared network!')
 
         for subnet, subnet_config in network_config['subnet'].items():
+            if 'subnet_id' not in subnet_config:
+                raise ConfigError(f'Unique subnet ID not specified for subnet "{subnet}"')
+
+            if subnet_config['subnet_id'] in subnet_ids:
+                raise ConfigError(f'Subnet ID for subnet "{subnet}" is not unique')
+
+            subnet_ids.append(subnet_config['subnet_id'])
+
             if 'address_range' in subnet_config:
                 if 'start' in subnet_config['address_range']:
                     range6_start = []