diff --git a/metal/hosts.ini b/metal/hosts.ini
index a3a8ddcc..540156e4 100644
--- a/metal/hosts.ini
+++ b/metal/hosts.ini
@@ -9,3 +9,4 @@ metal3 ansible_host=192.168.1.113 mac='00-23-24-d1-f5-69'
 
 [metal:vars]
 ansible_user=root
+subnet=192.168.1.0/24
diff --git a/metal/roles/lxd/templates/leader.yaml.j2 b/metal/roles/lxd/templates/leader.yaml.j2
index 94950778..7b0082c3 100644
--- a/metal/roles/lxd/templates/leader.yaml.j2
+++ b/metal/roles/lxd/templates/leader.yaml.j2
@@ -4,7 +4,7 @@ config:
 networks:
 - config:
     bridge.mode: fan
-    fan.underlay_subnet: auto
+    fan.underlay_subnet: {{ hostvars[inventory_hostname]['subnet'] }}
   description: ""
   name: lxdfan0
   type: ""
diff --git a/test/hosts.ini b/test/hosts.ini
index d090be9b..5e735236 100644
--- a/test/hosts.ini
+++ b/test/hosts.ini
@@ -4,3 +4,4 @@ metal1 ansible_host=192.168.50.3
 
 [metal:vars]
 ansible_user=root
+subnet=192.168.50.0/24