diff --git a/firewall/firewall-add b/firewall/firewall-add
index 42d706f..99ba352 100755
--- a/firewall/firewall-add
+++ b/firewall/firewall-add
@@ -28,6 +28,13 @@ EXTRA_OPTIONS="$2 $3 $4"
       fi;
 
 
+if [[ $SOURCE_IP = "" ]]; then
+	$SOURCE_IP="0.0.0.0/0"
+fi;
+if [[ $TARGET_IP = "" ]]; then
+	$TARGET_IP="0.0.0.0/0"
+fi;
+
 ##############################
 
 echo 1 > /proc/sys/net/ipv4/ip_forward