diff --git a/scripts/inner.sh b/scripts/inner.sh
index f558070..171e3cd 100644
--- a/scripts/inner.sh
+++ b/scripts/inner.sh
@@ -12,18 +12,28 @@ ip link set dev vpn up
 ip addr flush dev vpn
 ip route flush dev vpn
 
-echo ${VPN_IPV4_ADDRESS}
-echo ${VPN_IPV6_ADDRESS}
+echo "-- <start> inner.sh --"
+
+echo "VPN_IPV4_ADDRESS=${VPN_IPV4_ADDRESS}"
+echo "VPN_IPV6_ADDRESS=${VPN_IPV6_ADDRESS}"
+
+echo "OUTER_ROUTE_V4=${OUTER_ROUTE_V4}"
+echo "OUTER_GATEWAY_V4=${OUTER_GATEWAY_V4}"
+
+echo "OUTER_ROUTE_V6=${OUTER_ROUTE_V6}"
+echo "OUTER_GATEWAY_V6=${OUTER_GATEWAY_V6}"
+
+echo "-- <end> inner.sh --"
 
 ip addr add ${VPN_IPV4_ADDRESS} dev vpn
 ip addr add ${VPN_IPV6_ADDRESS} dev vpn
 
-if [ -z ${OUTER_ROUTE_V4+x} ]
+if [ -n "${OUTER_ROUTE_V4}" && -n "${OUTER_GATEWAY_V4}" ]
 then
     ip -4 route add "${OUTER_ROUTE_V4}" via "${OUTER_GATEWAY_V4}"
 fi
 
-if [ -z ${OUTER_ROUTE_V6+x} ]
+if [ -n "${OUTER_ROUTE_V6}" && -n "${OUTER_GATEWAY_V6}" ]
 then
     ip -6 route add "${OUTER_ROUTE_V6}" via "${OUTER_GATEWAY_V6}"
 fi
diff --git a/scripts/outer.sh b/scripts/outer.sh
index e75f1bd..8f8ea6b 100644
--- a/scripts/outer.sh
+++ b/scripts/outer.sh
@@ -1,4 +1,18 @@
 #!/usr/bin/env bash
+
+echo "-- <start> outer.sh --"
+
+echo "VPN_IPV4_ADDRESS=${VPN_IPV4_ADDRESS}"
+echo "VPN_IPV6_ADDRESS=${VPN_IPV6_ADDRESS}"
+
+echo "OUTER_ROUTE_V4=${OUTER_ROUTE_V4}"
+echo "OUTER_GATEWAY_V4=${OUTER_GATEWAY_V4}"
+
+echo "OUTER_ROUTE_V6=${OUTER_ROUTE_V6}"
+echo "OUTER_GATEWAY_V6=${OUTER_GATEWAY_V6}"
+
+echo "-- <end> outer.sh --"
+
 ip link set dev veth-outer up
 ip addr add ${VETH_IPV4_ADDRESS} dev veth-outer
 ip addr add ${VETH_IPV6_ADDRESS} dev veth-outer