diff --git a/app/dns/dns.go b/app/dns/dns.go
index 93d248edd2d..20c60876f64 100644
--- a/app/dns/dns.go
+++ b/app/dns/dns.go
@@ -29,7 +29,7 @@ type DNS struct {
 	disableCache           bool
 	disableFallback        bool
 	disableFallbackIfMatch bool
-	ipOption               *dns.IPOption
+	ipOption               dns.IPOption
 	hosts                  *StaticHosts
 	clients                []*Client
 	ctx                    context.Context
@@ -60,22 +60,22 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 		return nil, newError("unexpected client IP length ", len(config.ClientIp))
 	}
 
-	var ipOption *dns.IPOption
+	var ipOption dns.IPOption
 	switch config.QueryStrategy {
 	case QueryStrategy_USE_IP:
-		ipOption = &dns.IPOption{
+		ipOption = dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 			FakeEnable: false,
 		}
 	case QueryStrategy_USE_IP4:
-		ipOption = &dns.IPOption{
+		ipOption = dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: false,
 			FakeEnable: false,
 		}
 	case QueryStrategy_USE_IP6:
-		ipOption = &dns.IPOption{
+		ipOption = dns.IPOption{
 			IPv4Enable: false,
 			IPv6Enable: true,
 			FakeEnable: false,
@@ -172,29 +172,27 @@ func (s *DNS) IsOwnLink(ctx context.Context) bool {
 
 // LookupIP implements dns.Client.
 func (s *DNS) LookupIP(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, dns.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-		FakeEnable: s.ipOption.FakeEnable,
-	})
+	return s.lookupIPInternal(domain, s.ipOption)
 }
 
 // LookupIPv4 implements dns.IPv4Lookup.
 func (s *DNS) LookupIPv4(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, dns.IPOption{
-		IPv4Enable: true,
-		IPv6Enable: false,
-		FakeEnable: s.ipOption.FakeEnable,
-	})
+	if !s.ipOption.IPv4Enable {
+		return nil, dns.ErrEmptyResponse
+	}
+	o := s.ipOption
+	o.IPv6Enable = false
+	return s.lookupIPInternal(domain, o)
 }
 
 // LookupIPv6 implements dns.IPv6Lookup.
 func (s *DNS) LookupIPv6(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, dns.IPOption{
-		IPv4Enable: false,
-		IPv6Enable: true,
-		FakeEnable: s.ipOption.FakeEnable,
-	})
+	if !s.ipOption.IPv6Enable {
+		return nil, dns.ErrEmptyResponse
+	}
+	o := s.ipOption
+	o.IPv4Enable = false
+	return s.lookupIPInternal(domain, o)
 }
 
 func (s *DNS) lookupIPInternal(domain string, option dns.IPOption) ([]net.IP, error) {
@@ -245,7 +243,7 @@ func (s *DNS) lookupIPInternal(domain string, option dns.IPOption) ([]net.IP, er
 
 // GetIPOption implements ClientWithIPOption.
 func (s *DNS) GetIPOption() *dns.IPOption {
-	return s.ipOption
+	return &s.ipOption
 }
 
 // SetQueryOption implements ClientWithIPOption.