diff --git a/component/outbound/dialer/alive_dialer_set.go b/component/outbound/dialer/alive_dialer_set.go
index a6bbfe1..6b2c4ac 100644
--- a/component/outbound/dialer/alive_dialer_set.go
+++ b/component/outbound/dialer/alive_dialer_set.go
@@ -84,13 +84,16 @@ func (a *AliveDialerSet) SetAlive(dialer *Dialer, alive bool) {
 	var (
 		latency    time.Duration
 		hasLatency bool
+		minPolicy  bool
 	)
 
 	switch a.selectionPolicy {
 	case consts.DialerSelectionPolicy_MinLastLatency:
 		latency, hasLatency = dialer.Latencies10.LastLatency()
+		minPolicy = true
 	case consts.DialerSelectionPolicy_MinAverage10Latencies:
 		latency, hasLatency = dialer.Latencies10.AvgLatency()
+		minPolicy = true
 	}
 
 	if alive {
@@ -128,8 +131,9 @@ func (a *AliveDialerSet) SetAlive(dialer *Dialer, alive bool) {
 			// This dialer is already not alive.
 		}
 	}
-	oldBestDialer := a.minLatency.dialer
+
 	if hasLatency {
+		oldBestDialer := a.minLatency.dialer
 		// Calc minLatency.
 		a.dialerToLatency[dialer] = latency
 		if latency < a.minLatency.latency {
@@ -144,7 +148,7 @@ func (a *AliveDialerSet) SetAlive(dialer *Dialer, alive bool) {
 			a.log.Infof("Group [%v] switched dialer to <%v> (%v): %v", a.dialerGroupName, a.minLatency.dialer.Name(), a.selectionPolicy, a.minLatency.latency)
 		}
 	} else {
-		if alive && a.minLatency.dialer == nil {
+		if alive && minPolicy && a.minLatency.dialer == nil {
 			// Use first dialer if no dialer has alive state.
 			a.minLatency.dialer = dialer
 			a.log.Infof("Group [%v] switched dialer to <%v>", a.dialerGroupName, a.minLatency.dialer.Name())
diff --git a/example.conf b/example.conf
index e276c26..2d13598 100644
--- a/example.conf
+++ b/example.conf
@@ -55,7 +55,7 @@ group {
 
 routing {
     domain(geosite:category-ads) -> block
-    l4proto(udp) && mac('02:42:ac:11:00:03') -> BT
+    l4proto(udp) && mac('02:42:ac:11:00:03') -> my_group
     domain(geosite:category-ads) -> block
     domain(geosite:disney) -> disney
     domain(geosite:netflix) -> netflix
diff --git a/pkg/logger/logger.go b/pkg/logger/logger.go
index b38f7be..1059380 100644
--- a/pkg/logger/logger.go
+++ b/pkg/logger/logger.go
@@ -16,6 +16,8 @@ func NewLogger(verbose int) *logrus.Logger {
 		level = logrus.WarnLevel
 	case 1:
 		level = logrus.InfoLevel
+	case 2:
+		level = logrus.DebugLevel
 	default:
 		level = logrus.TraceLevel
 	}