diff --git a/tobiko/openstack/neutron/config.py b/tobiko/openstack/neutron/config.py
index 88175cf08..24ba74568 100644
--- a/tobiko/openstack/neutron/config.py
+++ b/tobiko/openstack/neutron/config.py
@@ -27,12 +27,17 @@ OPTIONS = [
     cfg.IntOpt('ipv4_prefixlen',
                default=24,
                help="The mask bits for IPv4 subnets"),
+    cfg.ListOpt('ipv4_dns_nameservers',
+                default=['8.8.8.8', '8.8.4.4'],
+                help="The CIDR block to allocate IPv4 subnets from"),
     cfg.StrOpt('ipv6_cidr',
                default='2001:db8::/48',
                help="The CIDR block to allocate IPv6 subnets from"),
     cfg.IntOpt('ipv6_prefixlen',
                default=64,
                help="The mask bits for IPv6 subnets"),
+    cfg.ListOpt('ipv6_dns_nameservers',
+                help="The CIDR block to allocate IPv4 subnets from"),
     cfg.IntOpt('custom_mtu_size',
                default=1350,
                help=("Customized maximum transfer unit size\n"
diff --git a/tobiko/openstack/stacks/_neutron.py b/tobiko/openstack/stacks/_neutron.py
index cfdc20502..28cadb58f 100644
--- a/tobiko/openstack/stacks/_neutron.py
+++ b/tobiko/openstack/stacks/_neutron.py
@@ -158,6 +158,10 @@ class NetworkStackFixture(heat.HeatStackFixture):
     def ipv4_subnet_gateway_ip(self):
         return netaddr.IPAddress(self.ipv4_subnet_details['gateway_ip'])
 
+    @property
+    def ipv4_dns_nameservers(self):
+        return ','.join(CONF.tobiko.neutron.ipv4_dns_nameservers or [])
+
     @property
     def ipv6_subnet_details(self):
         return neutron.get_subnet(self.ipv6_subnet_id)
@@ -170,6 +174,10 @@ class NetworkStackFixture(heat.HeatStackFixture):
     def ipv6_subnet_gateway_ip(self):
         return netaddr.IPAddress(self.ipv6_subnet_details['gateway_ip'])
 
+    @property
+    def ipv6_dns_nameservers(self):
+        return ','.join(CONF.tobiko.neutron.ipv6_dns_nameservers or [])
+
     @property
     def gateway_details(self):
         return neutron.get_router(self.gateway_id)
diff --git a/tobiko/openstack/stacks/neutron/network.yaml b/tobiko/openstack/stacks/neutron/network.yaml
index 11a5ab29c..65bf23cdf 100644
--- a/tobiko/openstack/stacks/neutron/network.yaml
+++ b/tobiko/openstack/stacks/neutron/network.yaml
@@ -42,16 +42,12 @@ parameters:
   ipv4_dns_nameservers:
     description: IPv4 nameservers IP addresses
     type: comma_delimited_list
-    default: []
-    constraints:
-      - custom_constraint: dns_name
+    default: ''
 
   ipv6_dns_nameservers:
     description: IPv6 nameservers IP addresses
     type: comma_delimited_list
-    default: []
-    constraints:
-      - custom_constraint: dns_name
+    default: ''
 
   ipv6_address_mode:
     description: IPv6 address mode