diff --git a/cmd/gost/route.go b/cmd/gost/route.go
index d6a4f18..2a8a6a4 100644
--- a/cmd/gost/route.go
+++ b/cmd/gost/route.go
@@ -9,7 +9,6 @@ import (
 	"net/url"
 	"os"
 	"strings"
-	"time"
 
 	"github.com/ginuerzh/gost"
 	"github.com/go-log/log"
@@ -136,6 +135,8 @@ func parseChainNode(ns string) (nodes []gost.Node, err error) {
 	wsOpts.UserAgent = node.Get("agent")
 	wsOpts.Path = node.Get("path")
 
+	timeout := node.GetDuration("timeout")
+
 	var host string
 
 	var tr gost.Transporter
@@ -175,8 +176,8 @@ func parseChainNode(ns string) (nodes []gost.Node, err error) {
 		config := &gost.QUICConfig{
 			TLSConfig:   tlsCfg,
 			KeepAlive:   node.GetBool("keepalive"),
-			Timeout:     time.Duration(node.GetInt("timeout")) * time.Second,
-			IdleTimeout: time.Duration(node.GetInt("idle")) * time.Second,
+			Timeout:     timeout,
+			IdleTimeout: node.GetDuration("idle"),
 		}
 
 		if cipher := node.Get("cipher"); cipher != "" {
@@ -232,9 +233,8 @@ func parseChainNode(ns string) (nodes []gost.Node, err error) {
 		connector = gost.AutoConnector(node.User)
 	}
 
-	timeout := node.GetInt("timeout")
 	node.DialOptions = append(node.DialOptions,
-		gost.TimeoutDialOption(time.Duration(timeout)*time.Second),
+		gost.TimeoutDialOption(timeout),
 	)
 
 	node.ConnectOptions = []gost.ConnectOption{
@@ -250,8 +250,8 @@ func parseChainNode(ns string) (nodes []gost.Node, err error) {
 		gost.HostHandshakeOption(host),
 		gost.UserHandshakeOption(node.User),
 		gost.TLSConfigHandshakeOption(tlsCfg),
-		gost.IntervalHandshakeOption(time.Duration(node.GetInt("ping")) * time.Second),
-		gost.TimeoutHandshakeOption(time.Duration(timeout) * time.Second),
+		gost.IntervalHandshakeOption(node.GetDuration("ping")),
+		gost.TimeoutHandshakeOption(timeout),
 		gost.RetryHandshakeOption(node.GetInt("retry")),
 	}
 	node.Client = &gost.Client{
@@ -339,10 +339,8 @@ func (r *route) GenRouters() ([]router, error) {
 		wsOpts.WriteBufferSize = node.GetInt("wbuf")
 		wsOpts.Path = node.Get("path")
 
-		ttl, err := time.ParseDuration(node.Get("ttl"))
-		if err != nil {
-			ttl = time.Duration(node.GetInt("ttl")) * time.Second
-		}
+		ttl := node.GetDuration("ttl")
+		timeout := node.GetDuration("timeout")
 
 		tunRoutes := parseIPRoutes(node.Get("route"))
 		gw := net.ParseIP(node.Get("gw")) // default gateway
@@ -393,8 +391,8 @@ func (r *route) GenRouters() ([]router, error) {
 			config := &gost.QUICConfig{
 				TLSConfig:   tlsCfg,
 				KeepAlive:   node.GetBool("keepalive"),
-				Timeout:     time.Duration(node.GetInt("timeout")) * time.Second,
-				IdleTimeout: time.Duration(node.GetInt("idle")) * time.Second,
+				Timeout:     timeout,
+				IdleTimeout: node.GetDuration("idle"),
 			}
 			if cipher := node.Get("cipher"); cipher != "" {
 				sum := sha256.Sum256([]byte(cipher))
@@ -555,7 +553,11 @@ func (r *route) GenRouters() ([]router, error) {
 
 		resolver := parseResolver(node.Get("dns"))
 		if resolver != nil {
-			resolver.Init(gost.ChainResolverOption(chain))
+			resolver.Init(
+				gost.ChainResolverOption(chain),
+				gost.TimeoutResolverOption(timeout),
+				gost.TTLResolverOption(ttl),
+			)
 		}
 
 		handler.Init(
@@ -573,7 +575,7 @@ func (r *route) GenRouters() ([]router, error) {
 			gost.ResolverHandlerOption(resolver),
 			gost.HostsHandlerOption(hosts),
 			gost.RetryHandlerOption(node.GetInt("retry")), // override the global retry option.
-			gost.TimeoutHandlerOption(time.Duration(node.GetInt("timeout"))*time.Second),
+			gost.TimeoutHandlerOption(timeout),
 			gost.ProbeResistHandlerOption(node.Get("probe_resist")),
 			gost.KnockingHandlerOption(node.Get("knock")),
 			gost.NodeHandlerOption(node),
diff --git a/forward.go b/forward.go
index f11ae34..73e85b9 100644
--- a/forward.go
+++ b/forward.go
@@ -334,7 +334,6 @@ type tcpRemoteForwardListener struct {
 	sessionMux sync.Mutex
 	closed     chan struct{}
 	closeMux   sync.Mutex
-	errChan    chan error
 }
 
 // TCPRemoteForwardListener creates a Listener for TCP remote port forwarding server.
@@ -349,7 +348,6 @@ func TCPRemoteForwardListener(addr string, chain *Chain) (Listener, error) {
 		chain:    chain,
 		connChan: make(chan net.Conn, 1024),
 		closed:   make(chan struct{}),
-		errChan:  make(chan error),
 	}
 
 	if !ln.isChainValid() {
@@ -365,7 +363,7 @@ func TCPRemoteForwardListener(addr string, chain *Chain) (Listener, error) {
 func (l *tcpRemoteForwardListener) isChainValid() bool {
 	lastNode := l.chain.LastNode()
 	if (lastNode.Protocol == "forward" && lastNode.Transport == "ssh") ||
-		lastNode.Protocol == "socks5" {
+		lastNode.Protocol == "socks5" || lastNode.Protocol == "" {
 		return true
 	}
 	return false
@@ -431,7 +429,7 @@ func (l *tcpRemoteForwardListener) accept() (conn net.Conn, err error) {
 		return l.chain.Dial(l.addr.String())
 	}
 
-	if lastNode.Protocol == "socks5" {
+	if lastNode.Protocol == "socks5" || lastNode.Protocol == "" {
 		if lastNode.GetBool("mbind") {
 			return l.muxAccept() // multiplexing support for binding.
 		}
@@ -588,11 +586,9 @@ type udpRemoteForwardListener struct {
 	connMap  *udpConnMap
 	connChan chan net.Conn
 	ln       *net.UDPConn
-	errChan  chan error
 	ttl      time.Duration
 	closed   chan struct{}
 	closeMux sync.Mutex
-	once     sync.Once
 	config   *UDPListenConfig
 }
 
@@ -617,15 +613,12 @@ func UDPRemoteForwardListener(addr string, chain *Chain, cfg *UDPListenConfig) (
 		chain:    chain,
 		connMap:  new(udpConnMap),
 		connChan: make(chan net.Conn, backlog),
-		errChan:  make(chan error, 1),
 		closed:   make(chan struct{}),
 		config:   cfg,
 	}
 
 	go ln.listenLoop()
 
-	err = <-ln.errChan
-
 	return ln, err
 }
 
@@ -699,7 +692,7 @@ func (l *udpRemoteForwardListener) connect() (conn net.PacketConn, err error) {
 		}
 
 		lastNode := l.chain.LastNode()
-		if lastNode.Protocol == "socks5" {
+		if lastNode.Protocol == "socks5" || lastNode.Protocol == "" {
 			var cc net.Conn
 			cc, err = getSocks5UDPTunnel(l.chain, l.addr)
 			if err != nil {
@@ -716,11 +709,6 @@ func (l *udpRemoteForwardListener) connect() (conn net.PacketConn, err error) {
 			}
 		}
 
-		l.once.Do(func() {
-			l.errChan <- err
-			close(l.errChan)
-		})
-
 		if err != nil {
 			if tempDelay == 0 {
 				tempDelay = 1000 * time.Millisecond
diff --git a/node.go b/node.go
index 0d45fb2..336ac15 100644
--- a/node.go
+++ b/node.go
@@ -157,13 +157,16 @@ func (node *Node) GetBool(key string) bool {
 
 // GetInt converts node parameter value to int.
 func (node *Node) GetInt(key string) int {
-	n, _ := strconv.Atoi(node.Values.Get(key))
+	n, _ := strconv.Atoi(node.Get(key))
 	return n
 }
 
 // GetDuration converts node parameter value to time.Duration.
 func (node *Node) GetDuration(key string) time.Duration {
-	d, _ := time.ParseDuration(node.Values.Get(key))
+	d, err := time.ParseDuration(node.Get(key))
+	if err != nil {
+		d = time.Duration(node.GetInt(key)) * time.Second
+	}
 	return d
 }
 
diff --git a/resolver.go b/resolver.go
index 99529a0..e7b3f91 100644
--- a/resolver.go
+++ b/resolver.go
@@ -119,7 +119,9 @@ func (ns *NameServer) String() string {
 }
 
 type resolverOptions struct {
-	chain *Chain
+	chain   *Chain
+	timeout time.Duration
+	ttl     time.Duration
 }
 
 // ResolverOption allows a common way to set Resolver options.
@@ -132,6 +134,20 @@ func ChainResolverOption(chain *Chain) ResolverOption {
 	}
 }
 
+// TimeoutResolverOption sets the timeout for Resolver.
+func TimeoutResolverOption(timeout time.Duration) ResolverOption {
+	return func(opts *resolverOptions) {
+		opts.timeout = timeout
+	}
+}
+
+// TTLResolverOption sets the timeout for Resolver.
+func TTLResolverOption(ttl time.Duration) ResolverOption {
+	return func(opts *resolverOptions) {
+		opts.ttl = ttl
+	}
+}
+
 // Resolver is a name resolver for domain name.
 // It contains a list of name servers.
 type Resolver interface {
@@ -191,10 +207,17 @@ func (r *resolver) Init(opts ...ResolverOption) error {
 	}
 
 	timeout := r.timeout
+	if r.options.timeout != 0 {
+		timeout = r.options.timeout
+	}
 	if timeout <= 0 {
 		timeout = DefaultResolverTimeout
 	}
 
+	if r.options.ttl != 0 {
+		r.ttl = r.options.ttl
+	}
+
 	var nss []NameServer
 	for _, ns := range r.servers {
 		if err := ns.Init( // init all name servers
@@ -279,7 +302,7 @@ func (r *resolver) resolve(ex Exchanger, host string) (ips []net.IP, err error)
 }
 
 func (r *resolver) resolveIPs(ctx context.Context, ex Exchanger, mq *dns.Msg) (ips []net.IP, err error) {
-	mr, err := r.exchangeMsg(ctx, ex, mq)
+	mr, _, err := r.exchangeMsg(ctx, ex, mq)
 	if err != nil {
 		return
 	}
@@ -302,12 +325,20 @@ func (r *resolver) Exchange(ctx context.Context, query []byte) (reply []byte, er
 		return
 	}
 
+	var qs string
+	if len(mq.Question) > 0 {
+		qs = mq.Question[0].String()
+	}
+
 	var mr *dns.Msg
 	for _, ns := range r.copyServers() {
-		mr, err = r.exchangeMsg(ctx, ns.exchanger, mq)
+		var cache bool
+		mr, cache, err = r.exchangeMsg(ctx, ns.exchanger, mq)
+		log.Logf("[dns] exchange message %d via %s (cache hit: %v): %s", mq.Id, ns.String(), cache, qs)
 		if err == nil {
 			break
 		}
+		log.Logf("[dns] exchange message %d via %s: %s", mq.Id, ns.String(), err)
 	}
 	if err != nil {
 		return
@@ -315,12 +346,13 @@ func (r *resolver) Exchange(ctx context.Context, query []byte) (reply []byte, er
 	return mr.Pack()
 }
 
-func (r *resolver) exchangeMsg(ctx context.Context, ex Exchanger, mq *dns.Msg) (mr *dns.Msg, err error) {
+func (r *resolver) exchangeMsg(ctx context.Context, ex Exchanger, mq *dns.Msg) (mr *dns.Msg, cache bool, err error) {
 	// Only cache for single question.
 	if len(mq.Question) == 1 {
 		key := newResolverCacheKey(&mq.Question[0])
 		mr = r.cache.loadCache(key)
 		if mr != nil {
+			cache = true
 			mr.Id = mq.Id
 			return
 		}
@@ -340,9 +372,7 @@ func (r *resolver) exchangeMsg(ctx context.Context, ex Exchanger, mq *dns.Msg) (
 	}
 
 	mr = &dns.Msg{}
-	if err = mr.Unpack(reply); err != nil {
-		return nil, err
-	}
+	err = mr.Unpack(reply)
 
 	return
 }
diff --git a/socks.go b/socks.go
index acd3a39..39a7a9e 100644
--- a/socks.go
+++ b/socks.go
@@ -1400,14 +1400,14 @@ func (h *socks5Handler) handleUDPTunnel(conn net.Conn, req *gosocks5.Request) {
 		addr := req.Addr.String()
 
 		if !Can("rudp", addr, h.options.Whitelist, h.options.Blacklist) {
-			log.Logf("[socks5-udp] Unauthorized to udp bind to %s", addr)
+			log.Logf("[socks5] udp-tun Unauthorized to udp bind to %s", addr)
 			return
 		}
 
 		bindAddr, _ := net.ResolveUDPAddr("udp", addr)
 		uc, err := net.ListenUDP("udp", bindAddr)
 		if err != nil {
-			log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
+			log.Logf("[socks5] udp-tun %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
 			return
 		}
 		defer uc.Close()
@@ -1416,32 +1416,32 @@ func (h *socks5Handler) handleUDPTunnel(conn net.Conn, req *gosocks5.Request) {
 		socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
 		reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
 		if err := reply.Write(conn); err != nil {
-			log.Logf("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), socksAddr, err)
+			log.Logf("[socks5] udp-tun %s <- %s : %s", conn.RemoteAddr(), socksAddr, err)
 			return
 		}
 		if Debug {
-			log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), socksAddr, reply)
+			log.Logf("[socks5] udp-tun %s <- %s\n%s", conn.RemoteAddr(), socksAddr, reply)
 		}
-		log.Logf("[socks5-udp] %s <-> %s", conn.RemoteAddr(), socksAddr)
+		log.Logf("[socks5] udp-tun %s <-> %s", conn.RemoteAddr(), socksAddr)
 		h.tunnelServerUDP(conn, uc)
-		log.Logf("[socks5-udp] %s >-< %s", conn.RemoteAddr(), socksAddr)
+		log.Logf("[socks5] udp-tun %s >-< %s", conn.RemoteAddr(), socksAddr)
 		return
 	}
 
 	cc, err := h.options.Chain.Conn()
 	// connection error
 	if err != nil {
-		log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
+		log.Logf("[socks5] udp-tun %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
 		reply := gosocks5.NewReply(gosocks5.Failure, nil)
 		reply.Write(conn)
-		log.Logf("[socks5-udp] %s -> %s\n%s", conn.RemoteAddr(), req.Addr, reply)
+		log.Logf("[socks5] udp-tun %s -> %s\n%s", conn.RemoteAddr(), req.Addr, reply)
 		return
 	}
 	defer cc.Close()
 
 	cc, err = socks5Handshake(cc, userSocks5HandshakeOption(h.options.Chain.LastNode().User))
 	if err != nil {
-		log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
+		log.Logf("[socks5] udp-tun %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
 		return
 	}
 	// tunnel <-> tunnel, direct forwarding
@@ -1449,9 +1449,9 @@ func (h *socks5Handler) handleUDPTunnel(conn net.Conn, req *gosocks5.Request) {
 	// so we don't need to authenticate it, as it's as explicit as whitelisting
 	req.Write(cc)
 
-	log.Logf("[socks5-udp] %s <-> %s [tun]", conn.RemoteAddr(), cc.RemoteAddr())
+	log.Logf("[socks5] udp-tun %s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())
 	transport(conn, cc)
-	log.Logf("[socks5-udp] %s >-< %s [tun]", conn.RemoteAddr(), cc.RemoteAddr())
+	log.Logf("[socks5] udp-tun %s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())
 }
 
 func (h *socks5Handler) tunnelServerUDP(cc net.Conn, pc net.PacketConn) (err error) {
@@ -1469,7 +1469,7 @@ func (h *socks5Handler) tunnelServerUDP(cc net.Conn, pc net.PacketConn) (err err
 				return
 			}
 			if h.options.Bypass.Contains(addr.String()) {
-				log.Log("[udp-tun] [bypass] read from", addr)
+				log.Log("[socks5] udp-tun bypass read from", addr)
 				continue // bypass
 			}
 
@@ -1477,12 +1477,12 @@ func (h *socks5Handler) tunnelServerUDP(cc net.Conn, pc net.PacketConn) (err err
 			dgram := gosocks5.NewUDPDatagram(
 				gosocks5.NewUDPHeader(uint16(n), 0, toSocksAddr(addr)), b[:n])
 			if err := dgram.Write(cc); err != nil {
-				log.Logf("[udp-tun] %s <- %s : %s", cc.RemoteAddr(), dgram.Header.Addr, err)
+				log.Logf("[socks5] udp-tun %s <- %s : %s", cc.RemoteAddr(), dgram.Header.Addr, err)
 				errc <- err
 				return
 			}
 			if Debug {
-				log.Logf("[udp-tun] %s <<< %s length: %d", cc.RemoteAddr(), dgram.Header.Addr, len(dgram.Data))
+				log.Logf("[socks5] udp-tun %s <<< %s length: %d", cc.RemoteAddr(), dgram.Header.Addr, len(dgram.Data))
 			}
 		}
 	}()
@@ -1502,16 +1502,16 @@ func (h *socks5Handler) tunnelServerUDP(cc net.Conn, pc net.PacketConn) (err err
 				continue // drop silently
 			}
 			if h.options.Bypass.Contains(addr.String()) {
-				log.Log("[udp-tun] [bypass] write to", addr)
+				log.Log("[socks5] udp-tun bypass write to", addr)
 				continue // bypass
 			}
 			if _, err := pc.WriteTo(dgram.Data, addr); err != nil {
-				log.Logf("[udp-tun] %s -> %s : %s", cc.RemoteAddr(), addr, err)
+				log.Logf("[socks5] udp-tun %s -> %s : %s", cc.RemoteAddr(), addr, err)
 				errc <- err
 				return
 			}
 			if Debug {
-				log.Logf("[udp-tun] %s >>> %s length: %d", cc.RemoteAddr(), addr, len(dgram.Data))
+				log.Logf("[socks5] udp-tun %s >>> %s length: %d", cc.RemoteAddr(), addr, len(dgram.Data))
 			}
 		}
 	}()
@@ -1895,7 +1895,7 @@ func getSocks5UDPTunnel(chain *Chain, addr net.Addr) (net.Conn, error) {
 	if err != nil {
 		c.Close()
 	}
-	return conn, nil
+	return conn, err
 }
 
 type socks5UDPTunnelConn struct {