diff --git a/dev/fmt b/dev/fmt
index 977f8802..69c24eef 100755
--- a/dev/fmt
+++ b/dev/fmt
@@ -2,8 +2,8 @@
 cd "$(dirname "$0")"
 
 if [ "$(docker images -q neko_server_build 2> /dev/null)" == "" ]; then
-	echo "Image 'neko_server_build' not found. Run ./build first."
-	exit 1
+    echo "Image 'neko_server_build' not found. Run ./build first."
+    exit 1
 fi
 
 docker run -it --rm \
diff --git a/dev/go b/dev/go
index 731d1d14..ae0acf12 100755
--- a/dev/go
+++ b/dev/go
@@ -2,8 +2,8 @@
 cd "$(dirname "$0")"
 
 if [ "$(docker images -q neko_server_build 2> /dev/null)" == "" ]; then
-	echo "Image 'neko_server_build' not found. Run ./build first."
-	exit 1
+    echo "Image 'neko_server_build' not found. Run ./build first."
+    exit 1
 fi
 
 docker run -it \
diff --git a/dev/lint b/dev/lint
index a7aa6203..4124fda4 100755
--- a/dev/lint
+++ b/dev/lint
@@ -2,8 +2,8 @@
 cd "$(dirname "$0")"
 
 if [ "$(docker images -q neko_server_build 2> /dev/null)" == "" ]; then
-	echo "Image 'neko_server_build' not found. Run ./build first."
-	exit 1
+    echo "Image 'neko_server_build' not found. Run ./build first."
+    exit 1
 fi
 
 #
diff --git a/dev/start b/dev/start
index 514bd2f2..210e61c0 100755
--- a/dev/start
+++ b/dev/start
@@ -2,8 +2,8 @@
 cd "$(dirname "$0")"
 
 if [ -z "$(docker images -q neko_server_app 2> /dev/null)" ]; then
-	echo "Image 'neko_server_app' not found. Running ./build first."
-	./build
+    echo "Image 'neko_server_app' not found. Running ./build first."
+    ./build
 fi
 
 if [ -z $NEKO_PORT ]; then
@@ -22,6 +22,10 @@ if [ -z $NEKO_NAT1TO1 ]; then
         fi
     done
 
+    if [ -z $NEKO_NAT1TO1 ]; then
+        NEKO_NAT1TO1=$(hostname -I 2>/dev/null | awk '{print $1}')
+    fi
+
     if [ -z $NEKO_NAT1TO1 ]; then
         NEKO_NAT1TO1=$(hostname -i 2>/dev/null)
     fi
diff --git a/pkg/utils/json.go b/pkg/utils/deocde.go
similarity index 81%
rename from pkg/utils/json.go
rename to pkg/utils/deocde.go
index ff4883b0..12aeaec7 100644
--- a/pkg/utils/json.go
+++ b/pkg/utils/deocde.go
@@ -3,8 +3,14 @@ package utils
 import (
 	"encoding/json"
 	"reflect"
+
+	"github.com/mitchellh/mapstructure"
 )
 
+func Decode(input interface{}, output interface{}) error {
+	return mapstructure.Decode(input, output)
+}
+
 func Unmarshal(in any, raw []byte, callback func() error) error {
 	if err := json.Unmarshal(raw, &in); err != nil {
 		return err