diff --git a/config/config.go b/config/config.go
index f2ac2dbb..b9de6ed9 100644
--- a/config/config.go
+++ b/config/config.go
@@ -68,7 +68,7 @@ type rawConfig struct {
 	ExternalController string       `yaml:"external-controller"`
 	Secret             string       `yaml:"secret"`
 
-	DNS        *rawDNS                  `yaml:"dns"`
+	DNS        rawDNS                   `yaml:"dns"`
 	Proxy      []map[string]interface{} `yaml:"Proxy"`
 	ProxyGroup []map[string]interface{} `yaml:"Proxy Group"`
 	Rule       []string                 `yaml:"Rule"`
@@ -95,7 +95,7 @@ func readConfig(path string) (*rawConfig, error) {
 		Rule:       []string{},
 		Proxy:      []map[string]interface{}{},
 		ProxyGroup: []map[string]interface{}{},
-		DNS: &rawDNS{
+		DNS: rawDNS{
 			Enable: false,
 		},
 	}
@@ -353,7 +353,6 @@ func hostWithDefaultPort(host string, defPort string) (string, error) {
 
 func parseNameServer(servers []string) ([]dns.NameServer, error) {
 	nameservers := []dns.NameServer{}
-	log.Debugln("%#v", servers)
 
 	for idx, server := range servers {
 		// parse without scheme .e.g 8.8.8.8:53
@@ -387,7 +386,7 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 	return nameservers, nil
 }
 
-func parseDNS(cfg *rawDNS) (*DNS, error) {
+func parseDNS(cfg rawDNS) (*DNS, error) {
 	if cfg.Enable && len(cfg.NameServer) == 0 {
 		return nil, fmt.Errorf("If DNS configuration is turned on, NameServer cannot be empty")
 	}
diff --git a/dns/client.go b/dns/client.go
index dad0ff2f..f8c711b1 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -244,8 +244,6 @@ func New(config Config) *Resolver {
 		mmdb, _ = geoip2.Open(C.Path.MMDB())
 	})
 
-	println(config.EnhancedMode)
-
 	r := &Resolver{
 		main:    transform(config.Main),
 		ipv6:    config.IPv6,
diff --git a/tunnel/tunnel.go b/tunnel/tunnel.go
index 930bd070..0b4e4ff0 100644
--- a/tunnel/tunnel.go
+++ b/tunnel/tunnel.go
@@ -120,8 +120,6 @@ func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
 			log.Debugln("[DNS] %s --> %s", metadata.Host, ip.String())
 			metadata.IP = &ip
 		}
-	} else {
-		log.Debugln("[DNS] unknown%#v", metadata)
 	}
 
 	var proxy C.Proxy