diff --git a/update-ipv6.sh b/update-ipv6.sh
index 5261fa5..23427a1 100755
--- a/update-ipv6.sh
+++ b/update-ipv6.sh
@@ -2,6 +2,8 @@
 
 PASSWORD=""
 DOMAIN=""
+INTERFACE="eth0"
+FILENAME="/etc/haproxy/haproxy.cfg"
 
 usage(){
 cat << EOF
@@ -11,6 +13,8 @@ Dynamic DNS script helper that updates records in freedns.afraid.org if the IPV6
 Options:
   -f	Force update in record even if IP hasn't change
   --dry	Shows if the IP addres has changed without updating it 
+  -i  Interface name default: eth0
+  -F  Filename where to compare previous address default= /etc/haproxy/haproxy.cfg
 
 EOF
 exit 1
@@ -22,8 +26,8 @@ then
   usage
 fi
 
-for option in $@; do
-	case $option in
+while [[ ! -z "$1" ]]; do
+	case $1 in
 		-p) 
 			PASSWORD=$2
 			shift 2;;
@@ -31,28 +35,26 @@ for option in $@; do
 			DOMAIN=$2
 			shift 2;;
 	 	-f)	
-			FORCE=true;;
+			FORCE=true
+			shift 1;;
 		--dry)	
-			DRY=true;;
+			DRY=true
+			shift 1;;
+		-i)	
+			INTERFACE=$2
+			shift 2;;
 		*)
+			echo $option
 			usage;;
 	esac
 done
 
-echo pass $PASSWORD domain $DOMAIN force $FORCE dry $DRY
-exit 0
-
-echo $address
-if [[ $DRY ]]; then
-	exit 1;
-fi
-
-addresses=$(/usr/sbin/ifconfig eth0 | grep 'inet6.*global>' | awk  '{ print $2 }'); 
+addresses=$(/usr/sbin/ifconfig $INTERFACE | grep 'inet6.*global>' | awk  '{ print $2 }'); 
 GREAT=0
 add=""
 for address in $addresses; 
 do 
-	secs=$(/usr/sbin/ip addr show dev eth0 | grep -A1 $address | grep -v $address | awk '{ print $2}')
+	secs=$(/usr/sbin/ip addr show dev $INTERFACE | grep -A1 $address | grep -v $address | awk '{ print $2}')
 	if [ $GREAT -gt ${secs/sec/} ] || [ $GREAT == 0 ];
 	then
 		GREAT=${secs/sec/}
@@ -60,16 +62,23 @@ do
 	fi
 
 done
-	if [[ $add ]] && [[ -z $(grep $add /etc/haproxy/haproxy.cfg ) ]] ; then
-                hadd=$(cat /etc/haproxy/haproxy.cfg | grep -m 1 'bind.*ssl' | awk  '{ print $2 }');
-                sed -i s/${hadd::-4}/$add/ /etc/haproxy/haproxy.cfg
-		date
+echo $address
+	if [[ $add ]] && [[ -z $(grep $add $FILENAME ) ]] ; then
+		hadd=$(grep -o -m 1 'NAT1TO1=[^"]*' $FILENAME |  awk  'BEGIN {FS = "=" } ; { print $2 }');
+		if [[ $DRY ]]; then
+			echo "Address would change from $add to $hadd"
+			exit 1;
+		fi
+                sed -i s/${hadd}/$add/ $FILENAME 
 		echo curl --user "nextia365:$PASSWORD" -XPOST http://freedns.afraid.org/nic/update?hostname=$DOMAIN\&myip=$add
 		curl --user "nextia365:$PASSWORD" -XPOST http://freedns.afraid.org/nic/update?hostname=$DOMAIN\&myip=$add
-		systemctl restart haproxy
 	else
 		echo Unchanged
 		if [[ $FORCE ]]; then
 			curl --user "nextia365:$PASSWORD" -XPOST http://freedns.afraid.org/nic/update?hostname=$DOMAIN\&myip=$add
 		fi
 	fi
+if [[ $DRY ]]; then
+	echo "Address didn't change from $add"
+	exit 1;
+fi