diff --git a/tcp_tests/templates/heat-cicd-queens-dvr-sl/underlay.hot b/tcp_tests/templates/heat-cicd-queens-dvr-sl/underlay.hot
index f40e867..64f8c05 100644
--- a/tcp_tests/templates/heat-cicd-queens-dvr-sl/underlay.hot
+++ b/tcp_tests/templates/heat-cicd-queens-dvr-sl/underlay.hot
@@ -20,7 +20,7 @@
     default: "10.8.0.0/24"
   external_subnet_cidr:
     type: string
-    default: "192.168.200.0/24"
+    default: "10.9.0.0/16"
   management_subnet_cidr:
     type: string
     default: "10.7.0.0/24"