diff --git a/scripts/inner_basic.sh b/scripts/inner_basic.sh
index e750e9b..a43d10c 100644
--- a/scripts/inner_basic.sh
+++ b/scripts/inner_basic.sh
@@ -10,22 +10,23 @@ echo "VPN_IPV4_ADDRESS=${VPN_IPV4_ADDRESS}"
 echo "VPN_IPV6_ADDRESS=${VPN_IPV6_ADDRESS}"
 
 echo "-- <end> inner_basic.sh --"
-if [ -z "${VPN_IPV4_ADDRESS}" ]
+
+if [ -n "${VPN_IPV4_ADDRESS}" ]
 then
     ip addr add ${VPN_IPV4_ADDRESS} dev vpn
 fi
 
-if [ -z "${VPN_IPV6_ADDRESS}" ]
+if [ -n "${VPN_IPV6_ADDRESS}" ]
 then
     ip addr add ${VPN_IPV6_ADDRESS} dev vpn
 fi
 
-if [ -z "${VPN_IPV4_ADDRESS}" ]
+if [ -n "${VPN_IPV4_ADDRESS}" ]
 then
     ip -4 route add default dev vpn
 fi
 
-if [ -z "${VPN_IPV6_ADDRESS}" ]
+if [ -n "${VPN_IPV6_ADDRESS}" ]
 then
     ip -6 route add default dev vpn
 fi