--- interfaces.inc.old2	2016-04-21 18:57:29.322112000 +0100
+++ interfaces.inc	2016-04-21 19:44:08.653020000 +0100
@@ -772,6 +772,7 @@
 
 	/* Check if MTU was defined for this lagg interface */
 	$lagg_mtu = interface_find_child_cfgmtu($laggif);
+	
 	if ($lagg_mtu == 0 &&
 	    is_array($config['interfaces'])) {
 		foreach ($config['interfaces'] as $tmpinterface) {
@@ -782,7 +783,7 @@
 			}
 		}
 	}
-
+	
 	/* Just in case anything is not working well */
 	if ($lagg_mtu == 0) {
 		$lagg_mtu = 1500;
@@ -4971,6 +4972,7 @@
 
 	$interface = convert_real_interface_to_friendly_interface_name($realiface);
 	$vlans = link_interface_to_vlans($realiface);
+	$qinqs = link_interface_to_qinqs($realiface);
 	$bridge = link_interface_to_bridge($realiface);
 	if (!empty($interface)) {
 		$gifs = link_interface_to_gif($interface);
@@ -4994,6 +4996,19 @@
 			}
 		}
 	}
+	if (is_array($qinqs)) {
+		foreach ($qinqs as $qinq) {
+			$ifass = convert_real_interface_to_friendly_interface_name($qinq['vlanif']);
+			if (empty($ifass)) {
+				continue;
+			}
+			if (!empty($config['interfaces'][$ifass]['mtu'])) {
+				if (intval($config['interfaces'][$ifass]['mtu']) > $mtu) {
+					$mtu = intval($config['interfaces'][$ifass]['mtu']);
+				}
+			}
+		}
+	}
 	if (is_array($gifs)) {
 		foreach ($gifs as $gif) {
 			$ifass = convert_real_interface_to_friendly_interface_name($gif['gifif']);
@@ -5055,6 +5070,30 @@
 	}
 }
 
+function link_interface_to_qinqs($int, $action = "") {
+	global $config;
+
+	if (empty($int)) {
+		return;
+	}
+
+	if (is_array($config['qinqs']['qinqentry'])) {
+		$ifaces = array();
+		foreach ($config['qinqs']['qinqentry'] as $qinq) {
+			if ($int == $qinq['if']) {
+				if ($action == "update") {
+					interfaces_bring_up($int);
+				} else {
+					$ifaces[$qinq['tag']] = $qinq;
+				}
+			}
+		}
+		if (!empty($ifaces)) {
+			return $ifaces;
+		}
+	}
+}
+
 function link_interface_to_vips($int, $action = "", $vhid = '') {
 	global $config;