diff --git a/control/control_plane.go b/control/control_plane.go
index 4ca7181..a3cd3e5 100644
--- a/control/control_plane.go
+++ b/control/control_plane.go
@@ -283,6 +283,7 @@ func NewControlPlane(
 	); err != nil {
 		return nil, fmt.Errorf("ApplyRulesOptimizers error:\n%w", err)
 	}
+	routingA.Rules = nil // Release.
 	if log.IsLevelEnabled(logrus.DebugLevel) {
 		var debugBuilder strings.Builder
 		for _, rule := range rules {
diff --git a/control/routing_matcher_builder.go b/control/routing_matcher_builder.go
index d526a6f..039ac9b 100644
--- a/control/routing_matcher_builder.go
+++ b/control/routing_matcher_builder.go
@@ -255,6 +255,9 @@ func (b *RoutingMatcherBuilder) BuildKernspace() (err error) {
 	}); err != nil {
 		return fmt.Errorf("BpfMapBatchUpdate: %w", err)
 	}
+
+	// Release.
+	b.simulatedLpmTries = nil
 	return nil
 }
 
@@ -280,5 +283,7 @@ func (b *RoutingMatcherBuilder) BuildUserspace() (matcher *RoutingMatcher, err e
 	}
 	m.matches = b.rules
 
+	// Release.
+	b.simulatedDomainSet = nil
 	return &m, nil
 }
diff --git a/example.dae b/example.dae
index 9fe6976..f22178c 100644
--- a/example.dae
+++ b/example.dae
@@ -28,7 +28,7 @@ global {
     # Please make sure DNS traffic will go through and be forwarded by dae, which is REQUIRED for domain routing.
     # The upstream DNS answer MUST NOT be polluted, so domestic public DNS is not recommended.
     # The request to DNS upstream follows the routing defined below.
-    dns_upstream: 'tcp+udp://dns.google:53'
+    dns_upstream: 'udp://dns.alidns.com:53'
 
     # The LAN interface to bind. Use it if you only want to proxy LAN instead of localhost.
     # Multiple interfaces split by ",".