diff --git a/vars/aztest.yml b/vars/aztest.yml
index fd11cd8..c56f092 100644
--- a/vars/aztest.yml
+++ b/vars/aztest.yml
@@ -2,11 +2,19 @@
 # file: group_vars/aztest.yml
 
 # IP prefix for VMs
-mgmtbr_prefix: 192.168.250
+virt_nets:
+  - name: mgmtbr
+    ipv4_prefix: 192.168.250
+    head_vms: true
 
 # site domain suffix
 site_suffix: aztest.infra.opencloud.us
 
+# resolv.conf settings
+dns_search:
+  - aztest.infra.opencloud.us
+  - opencloud.cs.arizona.edu
+
 # NSD/Unbound settings
 
 nsd_zones:
@@ -18,16 +26,6 @@
       - { name: ns1 }
     nodelist: head_vm_list
 
-unbound_interfaces:
-  #  - 192.168.250.1/24
-  - 206.207.253.10/28
-
-# resolv.conf settings
-dns_servers:
-  - 206.207.253.10
-
-dns_search:
-  - aztest.infra.opencloud.us
-  - opencloud.cs.arizona.edu
-
+# If true, unbound listens on the head node's `ansible_default_ipv4` interface
+unbound_listen_on_default: True