diff --git a/cmd/dsnet.go b/cmd/dsnet.go
index 4dad8f3..8d2d99d 100644
--- a/cmd/dsnet.go
+++ b/cmd/dsnet.go
@@ -26,6 +26,7 @@ func main() {
 		dsnet.Up()
 
 	case "update":
+		dsnet.Update()
 
 	case "report":
 
diff --git a/update.go b/update.go
new file mode 100644
index 0000000..8befbbe
--- /dev/null
+++ b/update.go
@@ -0,0 +1,7 @@
+package dsnet
+
+func Update() {
+	// TODO check device settings first
+	conf := MustLoadDsnetConfig()
+	ConfigureDevice(conf)
+}