diff --git a/configMaker.nix b/configMaker.nix
index 4ab6644..601ac4a 100644
--- a/configMaker.nix
+++ b/configMaker.nix
@@ -29,7 +29,7 @@ let module_inst = {
 
       "me0" = { # mgmt
         enable = true;
-        management = true;
+        management = "192.168.42.6/24";
       };
     };
     vlans = {
diff --git a/moduleMaker.nix b/moduleMaker.nix
index 538a311..9227414 100644
--- a/moduleMaker.nix
+++ b/moduleMaker.nix
@@ -29,8 +29,9 @@ in with lib; {
           default = false;
         };
         management = mkOption {
-          type = types.bool;
-          default = false;
+          # FIXME : support ipv4 and ipv6, either static or dhcp (with the coffee)
+          type = types.nullOr types.str;
+          default = null;
         };
       };
     in builtins.listToAttrs (map (name: { inherit name; value = template name; }) interfaces);
@@ -46,7 +47,12 @@ in with lib; {
     intf_xmlGen = name: let
       disable_flag = if !cfg.interfaces.${name}.enable then "<disable/>" else "";
       # FIXME : need to enforce address in reality
-      mgmt_fam = if cfg.interfaces.${name}.management then "<inet><dhcp/></inet>" else "";
+      mgmt_fam = if !builtins.isNull cfg.interfaces.${name}.management then ''
+        <inet>
+          <address>
+            ${cfg.interfaces.${name}.management}
+          </address>
+        </inet>'' else "";
       members = map (vlan: "<members>${builtins.toString vlan}</members>") cfg.interfaces.${name}.vlans;
       eth_switch = if builtins.isNull cfg.interfaces.${name}.interface-mode then "" else ''
           <ethernet-switching>
@@ -68,7 +74,7 @@ in with lib; {
     interface_xmls = map intf_xmlGen interfaces;
     vlan_trust_table = let
       vlan_map = inter: vlan:
-        if builtins.isString vlan then
+        if builtins.isString vlan && cfg.interfaces.${inter}.enable then
           if cfg.interfaces.${inter}.dhcp_trusted then
             { ${vlan}.trust = inter; }
           else