--- elwix/config/etc/default/rc.d/014.gre.stop	2011/07/05 23:43:00	1.1
+++ elwix/config/etc/default/rc.d/014.gre.stop	2017/02/13 16:52:47	1.2
@@ -4,10 +4,16 @@ IFACE="gre0"
 
 TUNNEL="172.31.2.1 172.31.2.2"
 
-OPT=""
+OPTS=""
 IP="10.10.10.1/24 10.10.10.2"
 
+[ -z "$IFACE" ] && exit
+
 echo "Config GRE network interface $IFACE ..."
-ifconfig $IFACE create
+
+ifconfig $IFACE create || exit
 ifconfig $IFACE tunnel $TUNNEL
-ifconfig $IFACE inet $IP $OPT up
+if [ -n "$IP" ]; then
+	ifconfig $IFACE inet $IP
+fi
+ifconfig $IFACE $OPTS up