diff --git a/network/service_net_map.j2.yaml b/network/service_net_map.j2.yaml
index ae6789d80c..b27b1b4a48 100644
--- a/network/service_net_map.j2.yaml
+++ b/network/service_net_map.j2.yaml
@@ -70,7 +70,7 @@ parameters:
       RedisNetwork: {{ _service_nets.get('internal_api', 'ctlplane') }}
       # Guest VMs use GaneshaNetwork and cannot reach ctlplane network,
       # so default to external when storage_nfs is not available.
-      GaneshaNetwork: {{ _service_nets.get('storage_nfs', 'external') }}
+      GaneshaNetwork: {{ _service_nets.get('storage_nfs', _service_nets.get('external', 'ctlplane')) }}
       MysqlNetwork: {{ _service_nets.get('internal_api', 'ctlplane') }}
       SnmpdNetwork: ctlplane
       CephClusterNetwork: {{ _service_nets.get('storage_mgmt', 'ctlplane') }}