diff --git a/cmd/cmd.go b/cmd/cmd.go
index 7f22a48..71b64cf 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -21,10 +21,3 @@ var (
 func Execute() error {
 	return rootCmd.Execute()
 }
-
-func init() {
-	rootCmd.AddCommand(runCmd)
-	rootCmd.AddCommand(validateCmd)
-	rootCmd.AddCommand(exportCmd)
-	rootCmd.AddCommand(reloadCmd)
-}
diff --git a/cmd/export.go b/cmd/export.go
index 4c73d93..d09f105 100644
--- a/cmd/export.go
+++ b/cmd/export.go
@@ -27,5 +27,6 @@ var (
 )
 
 func init() {
+	rootCmd.AddCommand(exportCmd)
 	exportCmd.AddCommand(exportOutlineCmd)
 }
diff --git a/cmd/reload.go b/cmd/reload.go
index 4b46097..8a71b44 100644
--- a/cmd/reload.go
+++ b/cmd/reload.go
@@ -6,26 +6,42 @@
 package cmd
 
 import (
+	"fmt"
 	"github.com/spf13/cobra"
+	"github.com/v2rayA/dae/cmd/internal"
 	"os"
 	"strconv"
+	"strings"
 	"syscall"
 )
 
 var (
 	reloadCmd = &cobra.Command{
-		Use: "reload pid",
+		Use: "reload [pid]",
 		Run: func(cmd *cobra.Command, args []string) {
+			internal.AutoSu()
 			if len(args) == 0 {
-				cmd.Help()
-				os.Exit(1)
+				_pid, err := os.ReadFile(PidFilePath)
+				if err != nil {
+					fmt.Println("Failed to read pid file:", err)
+					os.Exit(1)
+				}
+				args = []string{strings.TrimSpace(string(_pid))}
 			}
 			pid, err := strconv.Atoi(args[0])
 			if err != nil {
 				cmd.Help()
 				os.Exit(1)
 			}
-			syscall.Kill(pid, syscall.SIGUSR1)
+			if err = syscall.Kill(pid, syscall.SIGUSR1); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println("OK")
 		},
 	}
 )
+
+func init() {
+	rootCmd.AddCommand(reloadCmd)
+}
\ No newline at end of file
diff --git a/cmd/run.go b/cmd/run.go
index f6bbb71..0e99541 100644
--- a/cmd/run.go
+++ b/cmd/run.go
@@ -10,6 +10,7 @@ import (
 	"github.com/v2rayA/dae/common/subscription"
 	"github.com/v2rayA/dae/config"
 	"github.com/v2rayA/dae/control"
+	"github.com/v2rayA/dae/pkg/config_parser"
 	"github.com/v2rayA/dae/pkg/logger"
 	"os"
 	"os/signal"
@@ -92,6 +93,7 @@ func Run(log *logrus.Logger, conf *config.Config) (err error) {
 		sigs <- nil
 	}()
 	reloading := false
+	isSuspend := false
 loop:
 	for sig := range sigs {
 		switch sig {
@@ -114,6 +116,9 @@ loop:
 				// Listening error.
 				break loop
 			}
+		case syscall.SIGHUP:
+			isSuspend = true
+			fallthrough
 		case syscall.SIGUSR1:
 			// Reload signal.
 			log.Warnln("[Reload] Received reload signal; prepare to reload")
@@ -121,15 +126,29 @@ loop:
 
 			// Load new config.
 			log.Warnln("[Reload] Load new config")
-			newConf, includes, err := readConfig(cfgFile)
-			if err != nil {
-				log.WithFields(logrus.Fields{
-					"err": err,
-				}).Errorln("[Reload] Failed to reload")
-				sdnotify.Ready()
-				continue
+			var newConf *config.Config
+			if isSuspend {
+				isSuspend = false
+				newConf, err = emptyConfig()
+				if err != nil {
+					log.WithFields(logrus.Fields{
+						"err": err,
+					}).Errorln("[Reload] Failed to reload")
+					sdnotify.Ready()
+					continue
+				}
+			} else {
+				var includes []string
+				newConf, includes, err = readConfig(cfgFile)
+				if err != nil {
+					log.WithFields(logrus.Fields{
+						"err": err,
+					}).Errorln("[Reload] Failed to reload")
+					sdnotify.Ready()
+					continue
+				}
+				log.Infof("Include config files: [%v]", strings.Join(includes, ", "))
 			}
-			log.Infof("Include config files: [%v]", strings.Join(includes, ", "))
 			// New logger.
 			log = logger.NewLogger(newConf.Global.LogLevel, disableTimestamp)
 			logrus.SetLevel(log.Level)
@@ -244,3 +263,18 @@ func readConfig(cfgFile string) (conf *config.Config, includes []string, err err
 	}
 	return conf, includes, nil
 }
+
+func emptyConfig() (conf *config.Config, err error) {
+	sections, err := config_parser.Parse(`global{} routing{}`)
+	if err != nil {
+		return nil, err
+	}
+	if conf, err = config.New(sections); err != nil {
+		return nil, err
+	}
+	return conf, nil
+}
+
+func init() {
+	rootCmd.AddCommand(runCmd)
+}
diff --git a/cmd/suspend.go b/cmd/suspend.go
new file mode 100644
index 0000000..2c59fc4
--- /dev/null
+++ b/cmd/suspend.go
@@ -0,0 +1,47 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) 2023, v2rayA Organization <team@v2raya.org>
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"github.com/v2rayA/dae/cmd/internal"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+var (
+	suspendCmd = &cobra.Command{
+		Use: "suspend [pid]",
+		Run: func(cmd *cobra.Command, args []string) {
+			internal.AutoSu()
+			if len(args) == 0 {
+				_pid, err := os.ReadFile(PidFilePath)
+				if err != nil {
+					fmt.Println("Failed to read pid file:", err)
+					os.Exit(1)
+				}
+				args = []string{strings.TrimSpace(string(_pid))}
+			}
+			pid, err := strconv.Atoi(args[0])
+			if err != nil {
+				cmd.Help()
+				os.Exit(1)
+			}
+			if err = syscall.Kill(pid, syscall.SIGHUP); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+			fmt.Println("OK")
+		},
+	}
+)
+
+func init() {
+	rootCmd.AddCommand(suspendCmd)
+}
diff --git a/cmd/validate.go b/cmd/validate.go
index 59bc712..401ff91 100644
--- a/cmd/validate.go
+++ b/cmd/validate.go
@@ -31,5 +31,7 @@ var (
 )
 
 func init() {
+	rootCmd.AddCommand(validateCmd)
+
 	validateCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file")
 }
diff --git a/control/dns_control.go b/control/dns_control.go
index 3615fee..d3cc93c 100644
--- a/control/dns_control.go
+++ b/control/dns_control.go
@@ -399,7 +399,7 @@ func (c *DnsController) dialSend(req *udpRequest, data []byte, upstream *dns.Ups
 			}
 		}()
 
-		_ = conn.SetDeadline(time.Now().Add(DnsNatTimeout))
+		_ = conn.SetDeadline(time.Now().Add(5 * time.Second))
 		_, err = conn.Write(data)
 		if err != nil {
 			if c.log.IsLevelEnabled(logrus.DebugLevel) {
@@ -446,7 +446,7 @@ func (c *DnsController) dialSend(req *udpRequest, data []byte, upstream *dns.Ups
 			}
 		}()
 
-		_ = conn.SetDeadline(time.Now().Add(DnsNatTimeout))
+		_ = conn.SetDeadline(time.Now().Add(5 * time.Second))
 		// We should write two byte length in the front of TCP DNS request.
 		bReq := pool.Get(2 + len(data))
 		defer pool.Put(bReq)
diff --git a/docs/getting-started/external-dns.md b/docs/getting-started/external-dns.md
index ff5adef..b062229 100644
--- a/docs/getting-started/external-dns.md
+++ b/docs/getting-started/external-dns.md
@@ -83,9 +83,3 @@ You should configure dae as follows:
 
 4. If you bind to LAN, make sure your DHCP server will distribute dae as the DNS server (DNS request should be forwarded by dae for domain based traffic split).
 
-## 
-
-
-   ```
-
-   ```
\ No newline at end of file
diff --git a/docs/getting-started/reload-and-suspend.md b/docs/getting-started/reload-and-suspend.md
new file mode 100644
index 0000000..f9eecd5
--- /dev/null
+++ b/docs/getting-started/reload-and-suspend.md
@@ -0,0 +1,30 @@
+# Reload and Suspend
+
+dae supports configuration reloading and program suspending, which can help you save a lot of time when modifying the configuration or temporarily suspend dae.
+
+**Reload**
+
+Generally, dae won't interrupt connections when reloading configuration. And it is very fast compared to restart.
+
+Usage:
+
+```shell
+dae reload
+```
+
+**Suspend**
+
+It will be useful if you want to suspend dae temporarily and recover it later.
+
+Usage:
+
+```shell
+dae suspend
+```
+
+If you want to recover, use reload:
+
+```shell
+dae reload
+```
+