diff --git a/go.sum b/go.sum
index a2490ec..506d560 100644
--- a/go.sum
+++ b/go.sum
@@ -10,20 +10,6 @@ github.com/fumiama/go-x25519 v1.0.0 h1:hiGg9EhseVmGCc8T1jECVkj8Keu/aJ1ZK05RM8Vua
 github.com/fumiama/go-x25519 v1.0.0/go.mod h1:8VOhfyGZzw4IUs4nCjQFqW9cA3V/QpSCtP3fo2dLNg4=
 github.com/fumiama/gofastTEA v0.0.6 h1:Yni3MXDbJVa/c4CecgdZDgCJK+fLdvGph+OBqY2mtiI=
 github.com/fumiama/gofastTEA v0.0.6/go.mod h1:+sBZ05nCA2skZkursHNvyr8kULlEetrYTM2y5kA4rQc=
-github.com/fumiama/water v0.0.0-20211231092156-6d316045a9f5 h1:tRJa7xCNyt7mwzQ8TCoMsOCFMUBii/iVLz3xj94f1Ds=
-github.com/fumiama/water v0.0.0-20211231092156-6d316045a9f5/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231093704-80ce1934600d h1:XMKhQfj3vQkOCFJhaEOaFZSpQ/m7GBfQxbS0UvFQUyY=
-github.com/fumiama/water v0.0.0-20211231093704-80ce1934600d/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231094148-0c176c6cfb9c h1:iUiK3OX2REWOaxiEtIRbruGF16ugP+5iJlEllOd7H0I=
-github.com/fumiama/water v0.0.0-20211231094148-0c176c6cfb9c/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231094422-8a0b0fd8ed4d h1:34xXCAysY3v92o6lLaUqCp/BD7OaS5cdPsB9JHrLQt8=
-github.com/fumiama/water v0.0.0-20211231094422-8a0b0fd8ed4d/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231094734-2f9b072abdda h1:M8JQiAEjHwBbrbGeKQRGFjyGk01JES+ReIcxvsm5EsM=
-github.com/fumiama/water v0.0.0-20211231094734-2f9b072abdda/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231133042-660c28923879 h1:zv328lpgEoyG41HbLMkP6VEagSkEyO/3Wvxe63KSF4g=
-github.com/fumiama/water v0.0.0-20211231133042-660c28923879/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
-github.com/fumiama/water v0.0.0-20211231133626-69e328bbf27b h1:+sCf88Vao4YJiOnaa1O2r/fh8XmEgVS1PRd44Nfd+e8=
-github.com/fumiama/water v0.0.0-20211231133626-69e328bbf27b/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
 github.com/fumiama/water v0.0.0-20211231134027-da391938d6ac h1:A/5A0rODsg+EQHH61Ew5mMUtDpRXaSNqHhPvW+fN4C4=
 github.com/fumiama/water v0.0.0-20211231134027-da391938d6ac/go.mod h1:BBnNY9PwK+UUn4trAU+H0qsMEypm7+3Bj1bVFuJItlo=
 github.com/fumiama/wintun v0.0.0-20211229152851-8bc97c8034c0 h1:WfrSFlIlCAtg6Rt2IGna0HhJYSDE45YVHiYqO4wwsEw=
diff --git a/gold/link/link.go b/gold/link/link.go
index c565d37..25957d7 100644
--- a/gold/link/link.go
+++ b/gold/link/link.go
@@ -91,7 +91,7 @@ func (l *Link) Write(p *head.Packet, istransfer bool) (n int, err error) {
 	totl := uint32(len(data))
 	i := 0
 	for ; int(totl)-i > int(l.me.mtu); i += int(l.me.mtu) {
-		logrus.Infoln("[link] split frag", i, ":", i+int(l.me.mtu), ", remain:", int(totl)-i-int(l.me.mtu))
+		logrus.Debugln("[link] split frag", i, ":", i+int(l.me.mtu), ", remain:", int(totl)-i-int(l.me.mtu))
 		packet := *p
 		packet.Data = data[:int(l.me.mtu)]
 		cnt, err := l.write(&packet, totl, uint16(uint(i)>>3), istransfer, true)
@@ -144,7 +144,7 @@ func (l *Link) write(p *head.Packet, datasz uint32, offset uint16, istransfer, h
 			if peerep == nil {
 				return 0, errors.New("[link] nil endpoint of " + p.Dst.String())
 			}
-			logrus.Infoln("[link] write", len(d), "bytes data from ep", l.me.myconn.LocalAddr(), "to", peerep, "offset:", fmt.Sprintf("%04x", offset))
+			logrus.Debugln("[link] write", len(d), "bytes data from ep", l.me.myconn.LocalAddr(), "to", peerep, "offset:", fmt.Sprintf("%04x", offset))
 			n, err = l.me.myconn.WriteToUDP(d, peerep)
 		} else {
 			logrus.Warnln("[link] drop packet: nil peerlink")
diff --git a/gold/link/listen.go b/gold/link/listen.go
index 99d413a..aa0ac42 100644
--- a/gold/link/listen.go
+++ b/gold/link/listen.go
@@ -30,7 +30,7 @@ func (m *Me) listen() (conn *net.UDPConn, err error) {
 							}
 						}
 						p, ok := m.IsInPeer(packet.Src.String())
-						logrus.Infoln("[link] recv from endpoint", addr, "src", packet.Src, "dst", packet.Dst)
+						logrus.Debugln("[link] recv from endpoint", addr, "src", packet.Src, "dst", packet.Dst)
 						// logrus.Debugln("[link] recv:", hex.EncodeToString(lbf))
 						if ok {
 							if p.pep == "" || p.pep != addr.String() {
@@ -47,7 +47,7 @@ func (m *Me) listen() (conn *net.UDPConn, err error) {
 										case LINK_STATUS_DOWN:
 											n, err = p.Write(head.NewPacket(head.ProtoHello, 0, p.peerip, 0, nil), false)
 											if err == nil {
-												logrus.Infoln("[link] send", n, "bytes hello ack packet")
+												logrus.Debugln("[link] send", n, "bytes hello ack packet")
 												p.status = LINK_STATUS_HALFUP
 											} else {
 												logrus.Errorln("[link] send hello ack packet error:", err)
@@ -58,31 +58,31 @@ func (m *Me) listen() (conn *net.UDPConn, err error) {
 											break
 										}
 									case head.ProtoNotify:
-										logrus.Infoln("[link] recv notify")
+										logrus.Debugln("[link] recv notify")
 										p.onNotify(packet)
 									case head.ProtoQuery:
-										logrus.Infoln("[link] recv query")
+										logrus.Debugln("[link] recv query")
 										p.onQuery(packet)
 									case head.ProtoData:
 										if p.pipe != nil {
 											p.pipe <- packet
-											logrus.Infoln("[link] deliver to pipe of", p.peerip)
+											logrus.Debugln("[link] deliver to pipe of", p.peerip)
 										} else {
 											m.pipe <- packet.Data
-											logrus.Infoln("[link] deliver", len(packet.Data), "bytes data to pipe of me")
+											logrus.Debugln("[link] deliver", len(packet.Data), "bytes data to pipe of me")
 										}
 									default:
 										logrus.Warnln("[link] recv unknown proto:", packet.Proto)
 									}
 								} else {
-									logrus.Infoln("[link] drop invalid packet")
+									logrus.Debugln("[link] drop invalid packet")
 								}
 							} else if p.Accept(packet.Dst) {
 								if p.allowtrans {
 									// 转发
 									n, err = p.Write(packet, true)
 									if err == nil {
-										logrus.Infoln("[link] trans", n, "bytes packet to", packet.Dst.String()+":"+strconv.Itoa(int(packet.DstPort)))
+										logrus.Debugln("[link] trans", n, "bytes packet to", packet.Dst.String()+":"+strconv.Itoa(int(packet.DstPort)))
 									} else {
 										logrus.Errorln("[link] trans packet to", packet.Dst.String()+":"+strconv.Itoa(int(packet.DstPort)), "err:", err)
 									}
diff --git a/gold/link/recv.go b/gold/link/recv.go
index c37deb9..8efb185 100644
--- a/gold/link/recv.go
+++ b/gold/link/recv.go
@@ -39,7 +39,7 @@ func (m *Me) initrecvpool() {
 
 func (m *Me) wait(data []byte) *head.Packet {
 	flags := binary.LittleEndian.Uint16(data[10:12])
-	logrus.Infoln("[recv]", len(data), "bytes data with flag", hex.EncodeToString(data[10:12]))
+	logrus.Debugln("[recv]", len(data), "bytes data with flag", hex.EncodeToString(data[10:12]))
 	if flags == 0 || flags == 0x4000 {
 		h := &head.Packet{}
 		_, err := h.Unmarshal(data)
@@ -56,13 +56,13 @@ func (m *Me) wait(data []byte) *head.Packet {
 	hsh := *(*[32]byte)(*(*unsafe.Pointer)(unsafe.Pointer(&hashd)))
 	h, ok := m.recving[hsh]
 	if ok {
-		logrus.Infoln("[recv] get another frag part of", hex.EncodeToString(hashd))
+		logrus.Debugln("[recv] get another frag part of", hex.EncodeToString(hashd))
 		ok, err := h.Unmarshal(data)
 		if err == nil {
 			if ok {
 				delete(m.clock, h)
 				delete(m.recving, hsh)
-				logrus.Infoln("[recv] all parts of", hex.EncodeToString(hashd), "is reached")
+				logrus.Debugln("[recv] all parts of", hex.EncodeToString(hashd), "is reached")
 				return h
 			}
 			m.clock[h] = 0
@@ -71,7 +71,7 @@ func (m *Me) wait(data []byte) *head.Packet {
 		}
 		return nil
 	}
-	logrus.Infoln("[recv] get new frag part of", hex.EncodeToString(hashd))
+	logrus.Debugln("[recv] get new frag part of", hex.EncodeToString(hashd))
 	h = &head.Packet{}
 	_, err := h.Unmarshal(data)
 	if err != nil {
diff --git a/gold/link/router.go b/gold/link/router.go
index 23afcce..cc69c5f 100644
--- a/gold/link/router.go
+++ b/gold/link/router.go
@@ -55,7 +55,7 @@ func (r *Router) NextHop(ip string) (l *Link) {
 	for _, c := range r.list {
 		if c.Contains(ipb) {
 			l = r.table[c.String()]
-			logrus.Infoln("[router] get nexthop to", ipb, "-->", c, "link", l)
+			logrus.Debugln("[router] get nexthop to", ipb, "-->", c, "link", l)
 			return l
 		}
 	}
diff --git a/lower/nic.go b/lower/nic.go
index a52fff3..e9417ec 100644
--- a/lower/nic.go
+++ b/lower/nic.go
@@ -55,7 +55,7 @@ func (nc *NIC) Start(m *link.Me) {
 				logrus.Errorln("[lower] recv write to nic err:", err)
 				break
 			}
-			logrus.Infoln("[lower] recv write", n, "bytes packet to nic")
+			logrus.Debugln("[lower] recv write", n, "bytes packet to nic")
 		}
 	}()
 	buf := make([]byte, (m.MTU()+68)*4096)  // 增加报头长度与 TEA 冗余
@@ -86,7 +86,7 @@ func (nc *NIC) Start(m *link.Me) {
 			n, rem = nc.send(m, rem)
 		}
 		if len(rem) > 0 {
-			logrus.Infoln("[lower] remain", len(rem), "bytes to send")
+			logrus.Debugln("[lower] remain", len(rem), "bytes to send")
 			if off > 0 {
 				off = copy(buf, rem)
 				isrev = true
@@ -152,7 +152,7 @@ func (nc *NIC) send(m *link.Me, packet []byte) (n int, rem []byte) {
 	packet = packet[:totl]
 	n = int(totl)
 	dst := waterutil.IPv4Destination(packet)
-	logrus.Infoln("[lower] sending", len(packet), "bytes packet from :"+strconv.Itoa(int(m.SrcPort())), "to", dst.String()+":"+strconv.Itoa(int(m.DstPort())))
+	logrus.Debugln("[lower] sending", len(packet), "bytes packet from :"+strconv.Itoa(int(m.SrcPort())), "to", dst.String()+":"+strconv.Itoa(int(m.DstPort())))
 	lnk, err := m.Connect(dst.String())
 	if err != nil {
 		logrus.Warnln("[lower] connect to peer", dst.String(), "err:", err)
diff --git a/main.go b/main.go
index 5f69975..0720c95 100644
--- a/main.go
+++ b/main.go
@@ -8,6 +8,7 @@ import (
 
 	base14 "github.com/fumiama/go-base16384"
 	curve "github.com/fumiama/go-x25519"
+	"github.com/sirupsen/logrus"
 
 	"github.com/fumiama/WireGold/config"
 	"github.com/fumiama/WireGold/helper"
@@ -20,8 +21,15 @@ func main() {
 	gen := flag.Bool("g", false, "generate key pair")
 	showp := flag.Bool("p", false, "show my publickey")
 	file := flag.String("c", "config.yaml", "specify conf file")
-	mtu := flag.Int("m", 32768-68, "mtu")
+	mtu := flag.Int("m", 32768-68, "set the mtu of wg")
+	debug := flag.Bool("d", false, "print debug logs")
+	warn := flag.Bool("w", false, "only show logs above warn level")
 	flag.Parse()
+	if *debug {
+		logrus.SetLevel(logrus.DebugLevel)
+	} else if *warn {
+		logrus.SetLevel(logrus.WarnLevel)
+	}
 	if *help {
 		displayHelp("")
 	}