diff --git a/package/network/utils/comgt/files/ncm.sh b/package/network/utils/comgt/files/ncm.sh
index 6545091c82..38a4ba7a0b 100644
--- a/package/network/utils/comgt/files/ncm.sh
+++ b/package/network/utils/comgt/files/ncm.sh
@@ -10,6 +10,7 @@ proto_ncm_init_config() {
 	no_device=1
 	available=1
 	proto_config_add_string "device:device"
+	proto_config_add_string ifname
 	proto_config_add_string apn
 	proto_config_add_string auth
 	proto_config_add_string username
@@ -25,10 +26,10 @@ proto_ncm_init_config() {
 proto_ncm_setup() {
 	local interface="$1"
 
-	local manufacturer initialize setmode connect finalize ifname devname devpath
+	local manufacturer initialize setmode connect finalize devname devpath
 
-	local device apn auth username password pincode delay mode pdptype profile $PROTO_DEFAULT_OPTIONS
-	json_get_vars device apn auth username password pincode delay mode pdptype profile $PROTO_DEFAULT_OPTIONS
+	local device ifname  apn auth username password pincode delay mode pdptype profile $PROTO_DEFAULT_OPTIONS
+	json_get_vars device ifname apn auth username password pincode delay mode pdptype profile $PROTO_DEFAULT_OPTIONS
 
 	[ "$metric" = "" ] && metric="0"
 
@@ -53,17 +54,20 @@ proto_ncm_setup() {
 		return 1
 	}
 
-	devname="$(basename "$device")"
-	case "$devname" in
-	'tty'*)
-		devpath="$(readlink -f /sys/class/tty/$devname/device)"
-		ifname="$( ls "$devpath"/../../*/net )"
-		;;
-	*)
-		devpath="$(readlink -f /sys/class/usbmisc/$devname/device/)"
-		ifname="$( ls "$devpath"/net )"
-		;;
-	esac
+	[ -z "$ifname" ] && {
+		devname="$(basename "$device")"
+		case "$devname" in
+		'tty'*)
+			devpath="$(readlink -f /sys/class/tty/$devname/device)"
+			ifname="$( ls "$devpath"/../../*/net )"
+			;;
+		*)
+			devpath="$(readlink -f /sys/class/usbmisc/$devname/device/)"
+			ifname="$( ls "$devpath"/net )"
+			;;
+		esac
+	}
+
 	[ -n "$ifname" ] || {
 		echo "The interface could not be found."
 		proto_notify_error "$interface" NO_IFACE