diff --git a/external-network/main.tf b/external-network/main.tf
index c8d922f88221b80e5b1f4a2b662fe7abf3a83b5a..b4e6714a243b72342e35f3f041e09eb9142a0ef5 100644
--- a/external-network/main.tf
+++ b/external-network/main.tf
@@ -20,7 +20,7 @@ resource "openstack_networking_subnet_v2" "external_subnet" {
   network_id      = openstack_networking_network_v2.external_net.id
   cidr            = "192.168.100.0/24"
   ip_version      = 4
-  dns_nameservers = ["8.8.8.8"]
+  dns_nameservers = ["172.20.0.137", "172.20.0.3", "8.8.8.8"]
   enable_dhcp     = var.enable_dhcp
 }
 
@@ -46,4 +46,4 @@ output "external_subnet_id" {
 
 output "router_id" {
     value = openstack_networking_router_v2.router.id
-}
\ No newline at end of file
+}