diff --git a/proxy/loopback/config.pb.go b/proxy/loopback/config.pb.go
index b8a2602c6..e7ecdf0be 100644
--- a/proxy/loopback/config.pb.go
+++ b/proxy/loopback/config.pb.go
@@ -7,6 +7,7 @@
 package loopback
 
 import (
+	_ "github.com/v2fly/v2ray-core/v4/common/protoext"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -73,10 +74,14 @@ var file_proxy_loopback_config_proto_rawDesc = []byte{
 	0x0a, 0x1b, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b,
 	0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x19, 0x76,
 	0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e,
-	0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b, 0x22, 0x29, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66,
-	0x69, 0x67, 0x12, 0x1f, 0x0a, 0x0b, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x5f, 0x74, 0x61,
-	0x67, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64,
-	0x54, 0x61, 0x67, 0x42, 0x6c, 0x0a, 0x1d, 0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79,
+	0x6c, 0x6f, 0x6f, 0x70, 0x62, 0x61, 0x63, 0x6b, 0x1a, 0x20, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e,
+	0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x65, 0x78, 0x74, 0x2f, 0x65, 0x78, 0x74, 0x65, 0x6e, 0x73,
+	0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x47, 0x0a, 0x06, 0x43, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x12, 0x1f, 0x0a, 0x0b, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x5f,
+	0x74, 0x61, 0x67, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x69, 0x6e, 0x62, 0x6f, 0x75,
+	0x6e, 0x64, 0x54, 0x61, 0x67, 0x3a, 0x1c, 0x82, 0xb5, 0x18, 0x0a, 0x0a, 0x08, 0x6f, 0x75, 0x74,
+	0x62, 0x6f, 0x75, 0x6e, 0x64, 0x82, 0xb5, 0x18, 0x0a, 0x12, 0x08, 0x6c, 0x6f, 0x6f, 0x70, 0x62,
+	0x61, 0x63, 0x6b, 0x42, 0x6c, 0x0a, 0x1d, 0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79,
 	0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x6c, 0x6f, 0x6f, 0x70,
 	0x62, 0x61, 0x63, 0x6b, 0x50, 0x01, 0x5a, 0x2d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63,
 	0x6f, 0x6d, 0x2f, 0x76, 0x32, 0x66, 0x6c, 0x79, 0x2f, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2d, 0x63,
diff --git a/proxy/loopback/config.proto b/proxy/loopback/config.proto
index 0964ab0e7..28fbfd680 100644
--- a/proxy/loopback/config.proto
+++ b/proxy/loopback/config.proto
@@ -6,6 +6,11 @@ option go_package = "github.com/v2fly/v2ray-core/v4/proxy/loopback";
 option java_package = "com.v2ray.core.proxy.loopback";
 option java_multiple_files = true;
 
+import "common/protoext/extensions.proto";
+
 message Config {
+  option (v2ray.core.common.protoext.message_opt).type = "outbound";
+  option (v2ray.core.common.protoext.message_opt).short_name = "loopback";
+
   string inbound_tag = 1;
 }