diff --git a/.goreleaser.yml b/.goreleaser.yml
index 2754228..6cf287d 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -46,12 +46,6 @@ builds:
       - hardfloat
       - softfloat
 
-    ignore:
-      - goos: darwin
-        goarch: 386
-      - goos: freebsd
-        goarch: arm
-
 # https://goreleaser.com/customization/archive/
 archives:
   - id: default
diff --git a/README.md b/README.md
index b30cc8c..ee4b761 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ glider -h
 <summary>click to see details</summary>
 
 ```bash
-glider 0.14.0 usage:
+glider 0.15.0 usage:
   -check string
     	check=tcp[://HOST:PORT]: tcp port connect check
     	check=http://HOST[:PORT][/URI][#expect=STRING_IN_RESP_LINE]
@@ -119,6 +119,8 @@ glider 0.14.0 usage:
     	local dns server listen address
   -dnsalwaystcp
     	always use tcp to query upstream dns servers no matter there is a forwarder or not
+  -dnscachelog
+    	show query log of dns cache
   -dnscachesize int
     	size of CACHE (default 4096)
   -dnsmaxttl int
diff --git a/config.go b/config.go
index b2eaaf2..5f293c6 100644
--- a/config.go
+++ b/config.go
@@ -65,6 +65,7 @@ func parseConfig() *Config {
 	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.IntVar(&conf.DNSConfig.CacheSize, "dnscachesize", 4096, "size of CACHE")
+	flag.BoolVar(&conf.DNSConfig.CacheLog, "dnscachelog", false, "show query log of dns cache")
 	flag.StringSliceUniqVar(&conf.DNSConfig.Records, "dnsrecord", nil, "custom dns record, format: domain/ip")
 
 	// service configs
diff --git a/dns/client.go b/dns/client.go
index c3bff36..2347546 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -26,6 +26,7 @@ type Config struct {
 	Records   []string
 	AlwaysTCP bool
 	CacheSize int
+	CacheLog  bool
 }
 
 // Client is a dns client struct.
@@ -69,8 +70,10 @@ func (c *Client) Exchange(reqBytes []byte, clientAddr string, preferTCP bool) ([
 			v = valCopy(v)
 			binary.BigEndian.PutUint16(v[:2], req.ID)
 
-			log.F("[dns] %s <-> cache, type: %d, %s",
-				clientAddr, req.Question.QTYPE, req.Question.QNAME)
+			if c.config.CacheLog {
+				log.F("[dns] %s <-> cache, type: %d, %s",
+					clientAddr, req.Question.QTYPE, req.Question.QNAME)
+			}
 
 			if expired { // update cache
 				go func(qname string, reqBytes []byte, preferTCP bool) {
@@ -106,10 +109,11 @@ func (c *Client) handleAnswer(respBytes []byte, clientAddr, dnsServer, network,
 	}
 
 	ips, ttl := c.extractAnswer(resp)
-	if len(ips) != 0 && ttl > 0 {
-		c.cache.Set(qKey(resp.Question), valCopy(respBytes), ttl)
+	if ttl == 0 { // we got a null result
+		ttl = 600
 	}
 
+	c.cache.Set(qKey(resp.Question), valCopy(respBytes), ttl)
 	log.F("[dns] %s <-> %s(%s) via %s, type: %d, %s: %s",
 		clientAddr, dnsServer, network, dialerAddr, resp.Question.QTYPE, resp.Question.QNAME, strings.Join(ips, ","))
 
diff --git a/go.mod b/go.mod
index 11a9baf..d030756 100644
--- a/go.mod
+++ b/go.mod
@@ -8,17 +8,17 @@ require (
 	github.com/dgryski/go-idea v0.0.0-20170306091226-d2fb45a411fb
 	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152
 	github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
-	github.com/insomniacslk/dhcp v0.0.0-20210428091707-95b2ff6905c9
+	github.com/insomniacslk/dhcp v0.0.0-20210528123148-fb4eaaa00ad2
 	github.com/klauspost/cpuid/v2 v2.0.6 // indirect
 	github.com/klauspost/reedsolomon v1.9.12 // indirect
 	github.com/mdlayher/raw v0.0.0-20210412142147-51b895745faf // indirect
 	github.com/nadoo/conflag v0.2.3
 	github.com/nadoo/ipset v0.3.0
 	github.com/tjfoc/gmsm v1.4.0 // indirect
+	github.com/u-root/uio v0.0.0-20210528151154-e40b768296a7 // indirect
 	github.com/xtaci/kcp-go/v5 v5.6.1
-	golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e
-	golang.org/x/net v0.0.0-20210505024714-0287a6fb4125 // indirect
-	golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6 // indirect
+	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a
+	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
 )
 
 // Replace dependency modules with local developing copy
diff --git a/go.sum b/go.sum
index d6cd091..df9b7ba 100644
--- a/go.sum
+++ b/go.sum
@@ -39,8 +39,8 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714 h1:/jC7qQFrv8CrSJVmaolDVOxTfS9kc36uB6H40kdbQq8=
 github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714/go.mod h1:2Goc3h8EklBH5mspfHFxBnEoURQCGzQQH1ga9Myjvis=
-github.com/insomniacslk/dhcp v0.0.0-20210428091707-95b2ff6905c9 h1:T+Czi1NGxrbx8enhcdUFPVYTpGd6DPDxrKptDXRgD8I=
-github.com/insomniacslk/dhcp v0.0.0-20210428091707-95b2ff6905c9/go.mod h1:TKl4jN3Voofo4UJIicyNhWGp/nlQqQkFxmwIFTvBkKI=
+github.com/insomniacslk/dhcp v0.0.0-20210528123148-fb4eaaa00ad2 h1:WDOgJoE6rb7G6A7i1/Yyh5FJeydXeUrXHMRYJo7iFak=
+github.com/insomniacslk/dhcp v0.0.0-20210528123148-fb4eaaa00ad2/go.mod h1:h+MxyHxRg9NH3terB1nfRIUaQEcI0XOVkdR9LNBlp8E=
 github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
 github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
 github.com/jsimonetti/rtnetlink v0.0.0-20201009170750-9c6f07d100c1/go.mod h1:hqoO/u39cqLeBLebZ8fWdE96O7FxrAsRYhnVOdgHxok=
@@ -88,8 +88,9 @@ github.com/templexxx/xorsimd v0.4.1/go.mod h1:W+ffZz8jJMH2SXwuKu9WhygqBMbFnp14G2
 github.com/tjfoc/gmsm v1.3.2/go.mod h1:HaUcFuY0auTiaHB9MHFGCPx5IaLhTUd2atbCFBQXn9w=
 github.com/tjfoc/gmsm v1.4.0 h1:8nbaiZG+iVdh+fXVw0DZoZZa7a4TGm3Qab+xdrdzj8s=
 github.com/tjfoc/gmsm v1.4.0/go.mod h1:j4INPkHWMrhJb38G+J6W4Tw0AbuN8Thu3PbdVYhVcTE=
-github.com/u-root/u-root v7.0.0+incompatible h1:u+KSS04pSxJGI5E7WE4Bs9+Zd75QjFv+REkjy/aoAc8=
-github.com/u-root/u-root v7.0.0+incompatible/go.mod h1:RYkpo8pTHrNjW08opNd/U6p/RJE7K0D8fXO0d47+3YY=
+github.com/u-root/uio v0.0.0-20210528114334-82958018845c/go.mod h1:LpEX5FO/cB+WF4TYGY1V5qktpaZLkKkSegbr0V4eYXA=
+github.com/u-root/uio v0.0.0-20210528151154-e40b768296a7 h1:XMAtQHwKjWHIRwg+8Nj/rzUomQY1q6cM3ncA0wP8GU4=
+github.com/u-root/uio v0.0.0-20210528151154-e40b768296a7/go.mod h1:LpEX5FO/cB+WF4TYGY1V5qktpaZLkKkSegbr0V4eYXA=
 github.com/xtaci/kcp-go/v5 v5.6.1 h1:Pwn0aoeNSPF9dTS7IgiPXn0HEtaIlVb6y5UKWPsx8bI=
 github.com/xtaci/kcp-go/v5 v5.6.1/go.mod h1:W3kVPyNYwZ06p79dNwFWQOVFrdcBpDBsdyvK8moQrYo=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
@@ -103,8 +104,8 @@ golang.org/x/crypto v0.0.0-20191219195013-becbf705a915/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e h1:8foAy0aoO5GkqCvAEJ4VC4P3zksTg4X4aJCDpZzmgQI=
-golang.org/x/crypto v0.0.0-20210503195802-e9a32991a82e/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
+golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a h1:kr2P4QFmQr29mSLA43kwrOcgcReGTfbE9N577tCTuBc=
+golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
@@ -128,8 +129,8 @@ golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20201010224723-4f7140c49acb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210505024714-0287a6fb4125 h1:Ugb8sMTWuWRC3+sz5WeN/4kejDx9BvIwnPUiJBjJE+8=
-golang.org/x/net v0.0.0-20210505024714-0287a6fb4125/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210525063256-abc453219eb5 h1:wjuX4b5yYQnEQHzd+CBcrcC6OVR2J1CN6mUy0oSxIPo=
+golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -151,11 +152,10 @@ golang.org/x/sys v0.0.0-20200808120158-1030fc2bf1d9/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201101102859-da207088b7d1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201112073958-5cba982894dd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6 h1:cdsMqa2nXzqlgs183pHxtvoVwU7CyzaCTAUOg94af4c=
-golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210525143221-35b2ab0089ea h1:+WiDlPBBaO+h9vPNZi8uJ3k4BkKQB7Iow3aqwHVA5hI=
+golang.org/x/sys v0.0.0-20210525143221-35b2ab0089ea/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/main.go b/main.go
index c4cfa64..0f2d8a4 100644
--- a/main.go
+++ b/main.go
@@ -18,7 +18,7 @@ import (
 )
 
 var (
-	version = "0.14.0"
+	version = "0.15.0"
 	config  = parseConfig()
 )
 
diff --git a/rule/proxy.go b/rule/proxy.go
index b131f02..3ec5293 100644
--- a/rule/proxy.go
+++ b/rule/proxy.go
@@ -5,7 +5,6 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/nadoo/glider/log"
 	"github.com/nadoo/glider/proxy"
 )
 
@@ -131,8 +130,7 @@ func (p *Proxy) AddDomainIP(domain, ip string) error {
 			i = strings.LastIndexByte(domain[:i], '.')
 			if dialer, ok := p.domainMap.Load(domain[i+1:]); ok {
 				p.ipMap.Store(ip, dialer)
-				log.F("[rule] add ip=%s, based on rule: domain=%s & domain/ip: %s/%s\n",
-					ip, domain[i+1:], domain, ip)
+				// log.F("[rule] update map: %s/%s based on rule: domain=%s\n", domain, ip, domain[i+1:])
 			}
 		}
 	}