diff --git a/solution/network/docker-compose.yml b/solution/network/docker-compose.yml
index 6a29fa3..25ff1b0 100755
--- a/solution/network/docker-compose.yml
+++ b/solution/network/docker-compose.yml
@@ -75,8 +75,7 @@
         - ./ntsim-ng-o-du/o-ran-sc-du-hello-world-running.xml:/opt/dev/deploy/data/o-ran-sc-du-hello-world-running.xml
         - ./ntsim-ng-o-du/o-ran-sc-du-hello-world-operational.xml:/opt/dev/deploy/data/o-ran-sc-du-hello-world-operational.xml
     environment:
-        <<: *common_env
-        <<: *du_env
+        <<: [*common_env, *du_env]
 
   ntsim-ng-o-ru-fh-11221:
     <<: *common_nf
@@ -90,8 +89,7 @@
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-1/ietf-interfaces-operational.xml:/opt/dev/deploy/data/ietf-interfaces-operational.xml
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-1/ietf-interfaces-running.xml:/opt/dev/deploy/data/ietf-interfaces-running.xml
     environment:
-        <<: *common_env
-        <<: *ru_env
+        <<: [*common_env, *ru_env]
 
   ntsim-ng-o-ru-fh-11222:
     <<: *common_nf
@@ -105,8 +103,7 @@
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-2/ietf-interfaces-operational.xml:/opt/dev/deploy/data/ietf-interfaces-operational.xml
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-2/ietf-interfaces-running.xml:/opt/dev/deploy/data/ietf-interfaces-running.xml
     environment:
-        <<: *common_env
-        <<: *ru_env
+        <<: [*common_env, *ru_env]
 
   ntsim-ng-o-ru-fh-11223:
     <<: *common_nf
@@ -120,10 +117,10 @@
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-3/ietf-interfaces-operational.xml:/opt/dev/deploy/data/ietf-interfaces-operational.xml
         - ./ntsim-ng-o-ru/ntsim-ng-o-ru-fh-3/ietf-interfaces-running.xml:/opt/dev/deploy/data/ietf-interfaces-running.xml
     environment:
-        <<: *common_env
-        <<: *ru_env
+        <<: [*common_env, *ru_env]
 
 networks:
     default:
-        external:
-            name: oam
+        name: oam
+        external: true
+        
\ No newline at end of file