diff --git a/api/swagger.yaml b/api/swagger.yaml
index ab02a90..a3368b4 100644
--- a/api/swagger.yaml
+++ b/api/swagger.yaml
@@ -19,9 +19,11 @@ definitions:
         type: string
         x-go-name: PathPrefix
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   AdmissionConfig:
     properties:
+      file:
+        $ref: '#/definitions/FileLoader'
       matchers:
         items:
           type: string
@@ -30,15 +32,15 @@ definitions:
       name:
         type: string
         x-go-name: Name
+      redis:
+        $ref: '#/definitions/RedisLoader'
+      reload:
+        $ref: '#/definitions/Duration'
       reverse:
         type: boolean
         x-go-name: Reverse
-      type:
-        description: inline, file, etc.
-        type: string
-        x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   AuthConfig:
     properties:
       password:
@@ -48,7 +50,7 @@ definitions:
         type: string
         x-go-name: Username
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   AutherConfig:
     properties:
       auths:
@@ -56,17 +58,21 @@ definitions:
           $ref: '#/definitions/AuthConfig'
         type: array
         x-go-name: Auths
+      file:
+        $ref: '#/definitions/FileLoader'
       name:
         type: string
         x-go-name: Name
-      type:
-        description: inline, file, redis, etc.
-        type: string
-        x-go-name: Type
+      redis:
+        $ref: '#/definitions/RedisLoader'
+      reload:
+        $ref: '#/definitions/Duration'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   BypassConfig:
     properties:
+      file:
+        $ref: '#/definitions/FileLoader'
       matchers:
         items:
           type: string
@@ -75,15 +81,15 @@ definitions:
       name:
         type: string
         x-go-name: Name
+      redis:
+        $ref: '#/definitions/RedisLoader'
+      reload:
+        $ref: '#/definitions/Duration'
       reverse:
         type: boolean
         x-go-name: Reverse
-      type:
-        description: inline, file, etc.
-        type: string
-        x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   ChainConfig:
     properties:
       hops:
@@ -97,7 +103,7 @@ definitions:
       selector:
         $ref: '#/definitions/SelectorConfig'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   Config:
     properties:
       admissions:
@@ -133,6 +139,11 @@ definitions:
         $ref: '#/definitions/MetricsConfig'
       profiling:
         $ref: '#/definitions/ProfilingConfig'
+      recorders:
+        items:
+          $ref: '#/definitions/RecorderConfig'
+        type: array
+        x-go-name: Recorders
       resolvers:
         items:
           $ref: '#/definitions/ResolverConfig'
@@ -146,7 +157,7 @@ definitions:
       tls:
         $ref: '#/definitions/TLSConfig'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   ConnectorConfig:
     properties:
       auth:
@@ -162,7 +173,7 @@ definitions:
         type: string
         x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   DialerConfig:
     properties:
       auth:
@@ -178,7 +189,7 @@ definitions:
         type: string
         x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   Duration:
     description: |-
       A Duration represents the elapsed time between two instants
@@ -187,6 +198,23 @@ definitions:
     format: int64
     type: integer
     x-go-package: time
+  FileLoader:
+    properties:
+      path:
+        type: string
+        x-go-name: Path
+    type: object
+    x-go-package: github.com/go-gost/x/config
+  FileRecorder:
+    properties:
+      path:
+        type: string
+        x-go-name: Path
+      sep:
+        type: string
+        x-go-name: Sep
+    type: object
+    x-go-package: github.com/go-gost/x/config
   ForwarderConfig:
     properties:
       selector:
@@ -197,7 +225,7 @@ definitions:
         type: array
         x-go-name: Targets
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   HandlerConfig:
     properties:
       auth:
@@ -223,7 +251,7 @@ definitions:
         type: string
         x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   HopConfig:
     properties:
       bypass:
@@ -232,6 +260,9 @@ definitions:
       hosts:
         type: string
         x-go-name: Hosts
+      interface:
+        type: string
+        x-go-name: Interface
       name:
         type: string
         x-go-name: Name
@@ -245,8 +276,10 @@ definitions:
         x-go-name: Resolver
       selector:
         $ref: '#/definitions/SelectorConfig'
+      sockopts:
+        $ref: '#/definitions/SockOptsConfig'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   HostMappingConfig:
     properties:
       aliases:
@@ -261,9 +294,11 @@ definitions:
         type: string
         x-go-name: IP
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   HostsConfig:
     properties:
+      file:
+        $ref: '#/definitions/FileLoader'
       mappings:
         items:
           $ref: '#/definitions/HostMappingConfig'
@@ -272,12 +307,12 @@ definitions:
       name:
         type: string
         x-go-name: Name
-      type:
-        description: inline, file, etc.
-        type: string
-        x-go-name: Type
+      redis:
+        $ref: '#/definitions/RedisLoader'
+      reload:
+        $ref: '#/definitions/Duration'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   ListenerConfig:
     properties:
       auth:
@@ -299,7 +334,7 @@ definitions:
         type: string
         x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   LogConfig:
     properties:
       format:
@@ -312,20 +347,17 @@ definitions:
         type: string
         x-go-name: Output
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   MetricsConfig:
     properties:
       addr:
         type: string
         x-go-name: Addr
-      enable:
-        type: boolean
-        x-go-name: Enable
       path:
         type: string
         x-go-name: Path
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   NameserverConfig:
     properties:
       addr:
@@ -348,7 +380,7 @@ definitions:
       ttl:
         $ref: '#/definitions/Duration'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   NodeConfig:
     properties:
       addr:
@@ -364,24 +396,87 @@ definitions:
       hosts:
         type: string
         x-go-name: Hosts
+      interface:
+        type: string
+        x-go-name: Interface
       name:
         type: string
         x-go-name: Name
       resolver:
         type: string
         x-go-name: Resolver
+      sockopts:
+        $ref: '#/definitions/SockOptsConfig'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   ProfilingConfig:
     properties:
       addr:
         type: string
         x-go-name: Addr
-      enable:
-        type: boolean
-        x-go-name: Enable
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
+  RecorderConfig:
+    properties:
+      file:
+        $ref: '#/definitions/FileRecorder'
+      name:
+        type: string
+        x-go-name: Name
+      redis:
+        $ref: '#/definitions/RedisRecorder'
+    type: object
+    x-go-package: github.com/go-gost/x/config
+  RecorderObject:
+    properties:
+      name:
+        type: string
+        x-go-name: Name
+      record:
+        type: string
+        x-go-name: Record
+    type: object
+    x-go-package: github.com/go-gost/x/config
+  RedisLoader:
+    properties:
+      addr:
+        type: string
+        x-go-name: Addr
+      db:
+        format: int64
+        type: integer
+        x-go-name: DB
+      key:
+        type: string
+        x-go-name: Key
+      password:
+        type: string
+        x-go-name: Password
+      type:
+        type: string
+        x-go-name: Type
+    type: object
+    x-go-package: github.com/go-gost/x/config
+  RedisRecorder:
+    properties:
+      addr:
+        type: string
+        x-go-name: Addr
+      db:
+        format: int64
+        type: integer
+        x-go-name: DB
+      key:
+        type: string
+        x-go-name: Key
+      password:
+        type: string
+        x-go-name: Password
+      type:
+        type: string
+        x-go-name: Type
+    type: object
+    x-go-package: github.com/go-gost/x/config
   ResolverConfig:
     properties:
       name:
@@ -392,12 +487,8 @@ definitions:
           $ref: '#/definitions/NameserverConfig'
         type: array
         x-go-name: Nameservers
-      type:
-        description: inline, file, etc.
-        type: string
-        x-go-name: Type
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   Response:
     properties:
       code:
@@ -408,7 +499,7 @@ definitions:
         type: string
         x-go-name: Msg
     type: object
-    x-go-package: github.com/go-gost/core/api
+    x-go-package: github.com/go-gost/x/api
   SelectorConfig:
     properties:
       failTimeout:
@@ -421,7 +512,7 @@ definitions:
         type: string
         x-go-name: Strategy
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
   ServiceConfig:
     properties:
       addr:
@@ -440,16 +531,34 @@ definitions:
       hosts:
         type: string
         x-go-name: Hosts
+      interface:
+        type: string
+        x-go-name: Interface
       listener:
         $ref: '#/definitions/ListenerConfig'
       name:
         type: string
         x-go-name: Name
+      recorders:
+        items:
+          $ref: '#/definitions/RecorderObject'
+        type: array
+        x-go-name: Recorders
       resolver:
         type: string
         x-go-name: Resolver
+      sockopts:
+        $ref: '#/definitions/SockOptsConfig'
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
+  SockOptsConfig:
+    properties:
+      mark:
+        format: int64
+        type: integer
+        x-go-name: Mark
+    type: object
+    x-go-package: github.com/go-gost/x/config
   TLSConfig:
     properties:
       caFile:
@@ -468,7 +577,7 @@ definitions:
         type: string
         x-go-name: ServerName
     type: object
-    x-go-package: github.com/go-gost/core/config
+    x-go-package: github.com/go-gost/x/config
 info:
   title: Documentation of Web API.
   version: 1.0.0
diff --git a/dialer/kcp/dialer.go b/dialer/kcp/dialer.go
index 3678b2b..ebae3f1 100644
--- a/dialer/kcp/dialer.go
+++ b/dialer/kcp/dialer.go
@@ -146,7 +146,9 @@ func (d *kcpDialer) initSession(ctx context.Context, addr net.Addr, conn net.Pac
 
 	// stream multiplex
 	smuxConfig := smux.DefaultConfig()
-	smuxConfig.MaxReceiveBuffer = config.SockBuf
+	smuxConfig.Version = config.SmuxVer
+	smuxConfig.MaxReceiveBuffer = config.SmuxBuf
+	smuxConfig.MaxStreamBuffer = config.StreamBuf
 	smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
 	var cc net.Conn = kcpconn
 	if !config.NoComp {
diff --git a/dialer/kcp/metadata.go b/dialer/kcp/metadata.go
index 23108fd..1976f71 100644
--- a/dialer/kcp/metadata.go
+++ b/dialer/kcp/metadata.go
@@ -17,9 +17,17 @@ type metadata struct {
 func (d *kcpDialer) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		config           = "config"
+		configFile       = "c"
 		handshakeTimeout = "handshakeTimeout"
 	)
 
+	if file := mdx.GetString(md, configFile); file != "" {
+		d.md.config, err = kcp_util.ParseFromFile(file)
+		if err != nil {
+			return
+		}
+	}
+
 	if m := mdx.GetStringMap(md, config); len(m) > 0 {
 		b, err := json.Marshal(m)
 		if err != nil {
diff --git a/internal/util/kcp/config.go b/internal/util/kcp/config.go
index 85cfb0b..eef72fd 100644
--- a/internal/util/kcp/config.go
+++ b/internal/util/kcp/config.go
@@ -2,6 +2,8 @@ package kcp
 
 import (
 	"crypto/sha1"
+	"encoding/json"
+	"os"
 
 	"github.com/xtaci/kcp-go/v5"
 	"golang.org/x/crypto/pbkdf2"
@@ -31,6 +33,9 @@ var (
 		Resend:       0,
 		NoCongestion: 0,
 		SockBuf:      4194304,
+		SmuxVer:      1,
+		SmuxBuf:      4194304,
+		StreamBuf:    2097152,
 		KeepAlive:    10,
 		SnmpLog:      "",
 		SnmpPeriod:   60,
@@ -57,6 +62,9 @@ type Config struct {
 	Resend       int    `json:"resend"`
 	NoCongestion int    `json:"nc"`
 	SockBuf      int    `json:"sockbuf"`
+	SmuxBuf      int    `json:"smuxbuf"`
+	StreamBuf    int    `json:"streambuf"`
+	SmuxVer      int    `json:"smuxver"`
 	KeepAlive    int    `json:"keepalive"`
 	SnmpLog      string `json:"snmplog"`
 	SnmpPeriod   int    `json:"snmpperiod"`
@@ -64,6 +72,23 @@ type Config struct {
 	TCP          bool   `json:"tcp"`
 }
 
+func ParseFromFile(filename string) (*Config, error) {
+	if filename == "" {
+		return nil, nil
+	}
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	config := &Config{}
+	if err = json.NewDecoder(file).Decode(config); err != nil {
+		return nil, err
+	}
+	return config, nil
+}
+
 // Init initializes the KCP config.
 func (c *Config) Init() {
 	switch c.Mode {
@@ -76,6 +101,15 @@ func (c *Config) Init() {
 	case "fast3":
 		c.NoDelay, c.Interval, c.Resend, c.NoCongestion = 1, 10, 2, 1
 	}
+	if c.SmuxVer <= 0 {
+		c.SmuxVer = 1
+	}
+	if c.SmuxBuf <= 0 {
+		c.SmuxBuf = c.SockBuf
+	}
+	if c.StreamBuf <= 0 {
+		c.StreamBuf = c.SockBuf / 2
+	}
 }
 
 func BlockCrypt(key, crypt, salt string) (block kcp.BlockCrypt) {
diff --git a/listener/kcp/listener.go b/listener/kcp/listener.go
index 901b101..feef38f 100644
--- a/listener/kcp/listener.go
+++ b/listener/kcp/listener.go
@@ -146,7 +146,9 @@ func (l *kcpListener) mux(conn net.Conn) {
 	defer conn.Close()
 
 	smuxConfig := smux.DefaultConfig()
-	smuxConfig.MaxReceiveBuffer = l.md.config.SockBuf
+	smuxConfig.Version = l.md.config.SmuxVer
+	smuxConfig.MaxReceiveBuffer = l.md.config.SmuxBuf
+	smuxConfig.MaxStreamBuffer = l.md.config.StreamBuf
 	smuxConfig.KeepAliveInterval = time.Duration(l.md.config.KeepAlive) * time.Second
 
 	if !l.md.config.NoComp {
diff --git a/listener/kcp/metadata.go b/listener/kcp/metadata.go
index cdc7e46..89f3bdb 100644
--- a/listener/kcp/metadata.go
+++ b/listener/kcp/metadata.go
@@ -19,10 +19,18 @@ type metadata struct {
 
 func (l *kcpListener) parseMetadata(md mdata.Metadata) (err error) {
 	const (
-		backlog = "backlog"
-		config  = "config"
+		backlog    = "backlog"
+		config     = "config"
+		configFile = "c"
 	)
 
+	if file := mdx.GetString(md, configFile); file != "" {
+		l.md.config, err = kcp_util.ParseFromFile(file)
+		if err != nil {
+			return
+		}
+	}
+
 	if m := mdx.GetStringMap(md, config); len(m) > 0 {
 		b, err := json.Marshal(m)
 		if err != nil {