diff --git a/conf.go b/conf.go
index 342b1e7..aeca9d1 100644
--- a/conf.go
+++ b/conf.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/nadoo/conflag"
 
+	"github.com/nadoo/glider/dns"
 	"github.com/nadoo/glider/strategy"
 )
 
@@ -26,12 +27,8 @@ var conf struct {
 	RuleFile []string
 	RulesDir string
 
-	DNS        string
-	DNSServers []string
-	DNSTimeout int
-	DNSMaxTTL  int
-	DNSMinTTL  int
-	DNSRecords []string
+	DNS       string
+	DNSConfig dns.Config
 
 	IPSet string
 
@@ -53,11 +50,11 @@ func confInit() {
 	flag.StringVar(&conf.RulesDir, "rules-dir", "", "rule file folder")
 
 	flag.StringVar(&conf.DNS, "dns", "", "dns forwarder server listen address")
-	flag.StringSliceUniqVar(&conf.DNSServers, "dnsserver", []string{"8.8.8.8:53"}, "remote dns server")
-	flag.IntVar(&conf.DNSTimeout, "dnstimeout", 3, "timeout value used in multiple dnsservers switch(seconds)")
-	flag.IntVar(&conf.DNSMaxTTL, "dnsmaxttl", 1800, "maximum TTL value for entries in the CACHE(seconds)")
-	flag.IntVar(&conf.DNSMinTTL, "dnsminttl", 0, "minimum TTL value for entries in the CACHE(seconds)")
-	flag.StringSliceUniqVar(&conf.DNSRecords, "dnsrecord", nil, "custom dns record, format: domain/ip")
+	flag.StringSliceUniqVar(&conf.DNSConfig.Servers, "dnsserver", []string{"8.8.8.8:53"}, "remote dns server")
+	flag.IntVar(&conf.DNSConfig.Timeout, "dnstimeout", 3, "timeout value used in multiple dnsservers switch(seconds)")
+	flag.IntVar(&conf.DNSConfig.MaxTTL, "dnsmaxttl", 1800, "maximum TTL value for entries in the CACHE(seconds)")
+	flag.IntVar(&conf.DNSConfig.MinTTL, "dnsminttl", 0, "minimum TTL value for entries in the CACHE(seconds)")
+	flag.StringSliceUniqVar(&conf.DNSConfig.Records, "dnsrecord", nil, "custom dns record, format: domain/ip")
 
 	flag.StringVar(&conf.IPSet, "ipset", "", "ipset name")
 
diff --git a/dns/client.go b/dns/client.go
index f5ef83d..5b2694a 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -206,8 +206,8 @@ func (c *Client) exchangeUDP(rc net.Conn, reqBytes []byte) ([]byte, error) {
 	return reqBytes[:2+n], nil
 }
 
-// SetServer sets a upstream dns server for the given domain
-func (c *Client) SetServer(domain string, servers ...string) {
+// SetServers sets upstream dns servers for the given domain
+func (c *Client) SetServers(domain string, servers ...string) {
 	c.upServerMap[domain] = append(c.upServerMap[domain], servers...)
 }
 
diff --git a/main.go b/main.go
index 8a10f46..c625b23 100644
--- a/main.go
+++ b/main.go
@@ -40,14 +40,7 @@ func main() {
 
 	// DNS Server
 	if conf.DNS != "" {
-		dnscfg := &dns.Config{
-			Servers: conf.DNSServers,
-			Timeout: conf.DNSTimeout,
-			MaxTTL:  conf.DNSMaxTTL,
-			MinTTL:  conf.DNSMinTTL,
-			Records: conf.DNSRecords}
-
-		d, err := dns.NewServer(conf.DNS, dialer, dnscfg)
+		d, err := dns.NewServer(conf.DNS, dialer, &conf.DNSConfig)
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -56,7 +49,7 @@ func main() {
 		for _, r := range conf.rules {
 			for _, domain := range r.Domain {
 				if len(r.DNSServers) > 0 {
-					d.SetServer(domain, r.DNSServers...)
+					d.SetServers(domain, r.DNSServers...)
 				}
 			}
 		}
diff --git a/strategy/strategy.go b/strategy/strategy.go
index 8c65c03..1f624d8 100644
--- a/strategy/strategy.go
+++ b/strategy/strategy.go
@@ -151,7 +151,6 @@ func (rr *rrDialer) checkDialer(idx int) {
 	d := rr.fwdrs[idx]
 
 	for {
-
 		time.Sleep(time.Duration(rr.interval) * time.Second * time.Duration(retry>>1))
 
 		// check forwarders whose priority not less than current priority only