Some minor changes.

firewall/firewall-add

@@ -55,7 +55,7 @@ LINES=$($iptables --line-number -n --list POSTROUTING | grep $SOURCE_IP |grep $T
 
 if [ -n "$LINES" ] ; then
 	for i in $LINES; do 
-		$iptables -D POSTROUTING $i
+		$iptables -D PREROUTING $i
 		sleep 0.1
 	done
 fi