diff --git a/cmd/ctrld/cli.go b/cmd/ctrld/cli.go
index 080faec..6ef1c0f 100644
--- a/cmd/ctrld/cli.go
+++ b/cmd/ctrld/cli.go
@@ -168,7 +168,7 @@ func initCLI() {
 			// Processing --cd flag require connecting to ControlD API, which needs valid
 			// time for validating server certificate. Some routers need NTP synchronization
 			// to set the current time, so this check must happen before processCDFlags.
-			if err := router.PreRun(); err != nil {
+			if err := router.PreRun(svcConfig); err != nil {
 				mainLog.Fatal().Err(err).Msg("failed to perform router pre-run check")
 			}
 
diff --git a/internal/router/router.go b/internal/router/router.go
index 0c18f50..38c65b6 100644
--- a/internal/router/router.go
+++ b/internal/router/router.go
@@ -127,10 +127,13 @@ func ConfigureService(sc *service.Config) error {
 }
 
 // PreRun blocks until the router is ready for running ctrld.
-func PreRun() (err error) {
+func PreRun(svc *service.Config) (err error) {
 	// On some routers, NTP may out of sync, so waiting for it to be ready.
 	switch Name() {
-	case Merlin, Tomato:
+	case DDWrt, Merlin, Tomato:
+		// Cleanup router to ensure valid DNS for NTP synchronization.
+		_ = Cleanup(svc)
+
 		// Wait until `ntp_ready=1` set.
 		b := backoff.NewBackoff("PreRun", func(format string, args ...any) {}, 10*time.Second)
 		for {