diff --git a/src/cli/cli.go b/src/cli/cli.go
index f4f544b..49ca294 100644
--- a/src/cli/cli.go
+++ b/src/cli/cli.go
@@ -135,28 +135,6 @@ func Run() (err error) {
 	return app.Run(os.Args)
 }
 
-func getConfigDir() (homedir string, err error) {
-	homedir, err = os.UserHomeDir()
-	if err != nil {
-		log.Error(err)
-		return
-	}
-
-	if envHomedir, isSet := os.LookupEnv("CROC_CONFIG_DIR"); isSet {
-		homedir = envHomedir
-	} else if xdgConfigHome, isSet := os.LookupEnv("XDG_CONFIG_HOME"); isSet {
-		homedir = path.Join(xdgConfigHome, "croc")
-	} else {
-		homedir = path.Join(homedir, ".config", "croc")
-	}
-
-	if _, err = os.Stat(homedir); os.IsNotExist(err) {
-		log.Debugf("creating home directory %s", homedir)
-		err = os.MkdirAll(homedir, 0700)
-	}
-	return
-}
-
 func setDebugLevel(c *cli.Context) {
 	if c.Bool("debug") {
 		log.SetLevel("debug")
@@ -167,7 +145,7 @@ func setDebugLevel(c *cli.Context) {
 }
 
 func getConfigFile() string {
-	configFile, err := getConfigDir()
+	configFile, err := utils.GetConfigDir()
 	if err != nil {
 		log.Error(err)
 		return ""
@@ -446,7 +424,7 @@ func receive(c *cli.Context) (err error) {
 
 	// load options here
 	setDebugLevel(c)
-	configFile, err := getConfigDir()
+	configFile, err := utils.GetConfigDir()
 	if err != nil {
 		log.Error(err)
 		return
diff --git a/src/models/constants.go b/src/models/constants.go
index ca2543c..a6a0066 100644
--- a/src/models/constants.go
+++ b/src/models/constants.go
@@ -5,6 +5,9 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"path"
+
+	"github.com/schollz/croc/v9/src/utils"
 )
 
 // TCP_BUFFER_SIZE is the maximum packet size
@@ -41,12 +44,39 @@ var publicDns = []string{
 	"[2620:119:53::53]",      // Cisco OpenDNS
 }
 
+func getConfigFile() (fname string, err error) {
+	configFile, err := utils.GetConfigDir()
+	if err != nil {
+		return
+	}
+	fname = path.Join(configFile, "internal-dns")
+	return
+}
+
 func init() {
+	doRemember := false
 	for _, flag := range os.Args {
 		if flag == "--internal-dns" {
 			INTERNAL_DNS = true
 			break
 		}
+		if flag == "--remember" {
+			doRemember = true
+		}
+	}
+	if doRemember {
+		// save in config file
+		fname, err := getConfigFile()
+		if err == nil {
+			f, _ := os.Create(fname)
+			f.Close()
+		}
+	}
+	if !INTERNAL_DNS {
+		fname, err := getConfigFile()
+		if err == nil {
+			INTERNAL_DNS = utils.Exists(fname)
+		}
 	}
 	var err error
 	DEFAULT_RELAY, err = lookup(DEFAULT_RELAY)
diff --git a/src/utils/utils.go b/src/utils/utils.go
index 42a1520..dad783f 100644
--- a/src/utils/utils.go
+++ b/src/utils/utils.go
@@ -15,6 +15,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"path"
 	"strings"
 	"time"
 
@@ -23,6 +24,27 @@ import (
 	"github.com/schollz/mnemonicode"
 )
 
+// Get or create home directory
+func GetConfigDir() (homedir string, err error) {
+	homedir, err = os.UserHomeDir()
+	if err != nil {
+		return
+	}
+
+	if envHomedir, isSet := os.LookupEnv("CROC_CONFIG_DIR"); isSet {
+		homedir = envHomedir
+	} else if xdgConfigHome, isSet := os.LookupEnv("XDG_CONFIG_HOME"); isSet {
+		homedir = path.Join(xdgConfigHome, "croc")
+	} else {
+		homedir = path.Join(homedir, ".config", "croc")
+	}
+
+	if _, err = os.Stat(homedir); os.IsNotExist(err) {
+		err = os.MkdirAll(homedir, 0700)
+	}
+	return
+}
+
 // Exists reports whether the named file or directory exists.
 func Exists(name string) bool {
 	if _, err := os.Stat(name); err != nil {