diff --git a/roles/head-mgmtbr/defaults/main.yml b/roles/head-mgmtbr/defaults/main.yml
new file mode 100644
index 0000000..3b9cbc1
--- /dev/null
+++ b/roles/head-mgmtbr/defaults/main.yml
@@ -0,0 +1,8 @@
+---
+# head-mgmtbr/defaults/main.yml
+
+# public internet facing NAT interface
+mgmtbr_nat_interface: eth0
+
+# management interface bridged to mgmtbr
+mgmtbr_ext_interface: eth1