diff --git a/app/dispatcher/default.go b/app/dispatcher/default.go
index 1531866f4..c4629cc4f 100644
--- a/app/dispatcher/default.go
+++ b/app/dispatcher/default.go
@@ -178,8 +178,12 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 }
 
 func shouldOverride(result SniffResult, domainOverride []string) bool {
+	protocolString := result.Protocol()
+	if resComp, ok := result.(SnifferResultComposite); ok {
+		protocolString = resComp.ProtocolForDomainResult()
+	}
 	for _, p := range domainOverride {
-		if strings.HasPrefix(result.Protocol(), p) {
+		if strings.HasPrefix(protocolString, p) {
 			return true
 		}
 	}
@@ -203,15 +207,29 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 		ctx = session.ContextWithContent(ctx, content)
 	}
 	sniffingRequest := content.SniffingRequest
-	if destination.Network != net.Network_TCP || !sniffingRequest.Enabled {
+	switch {
+	case !sniffingRequest.Enabled:
 		go d.routedDispatch(ctx, outbound, destination)
-	} else {
+	case destination.Network != net.Network_TCP:
+		// Only metadata sniff will be used for non tcp connection
+		result, err := sniffer(ctx, nil, true)
+		if err == nil {
+			content.Protocol = result.Protocol()
+			if shouldOverride(result, sniffingRequest.OverrideDestinationForProtocol) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				ob.Target = destination
+			}
+		}
+		go d.routedDispatch(ctx, outbound, destination)
+	default:
 		go func() {
 			cReader := &cachedReader{
 				reader: outbound.Reader.(*pipe.Reader),
 			}
 			outbound.Reader = cReader
-			result, err := sniffer(ctx, cReader)
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
 			if err == nil {
 				content.Protocol = result.Protocol()
 			}
@@ -227,34 +245,50 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 	return inbound, nil
 }
 
-func sniffer(ctx context.Context, cReader *cachedReader) (SniffResult, error) {
+func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
 	payload := buf.New()
 	defer payload.Release()
 
-	sniffer := NewSniffer()
-	totalAttempt := 0
-	for {
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		default:
-			totalAttempt++
-			if totalAttempt > 2 {
-				return nil, errSniffingTimeout
-			}
+	sniffer := NewSniffer(ctx)
 
-			cReader.Cache(payload)
-			if !payload.IsEmpty() {
-				result, err := sniffer.Sniff(payload.Bytes())
-				if err != common.ErrNoClue {
-					return result, err
+	metaresult, metadataErr := sniffer.SniffMetadata(ctx)
+
+	if metadataOnly {
+		return metaresult, metadataErr
+	}
+
+	contentResult, contentErr := func() (SniffResult, error) {
+		totalAttempt := 0
+		for {
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			default:
+				totalAttempt++
+				if totalAttempt > 2 {
+					return nil, errSniffingTimeout
+				}
+
+				cReader.Cache(payload)
+				if !payload.IsEmpty() {
+					result, err := sniffer.Sniff(ctx, payload.Bytes())
+					if err != common.ErrNoClue {
+						return result, err
+					}
+				}
+				if payload.IsFull() {
+					return nil, errUnknownContent
 				}
 			}
-			if payload.IsFull() {
-				return nil, errUnknownContent
-			}
 		}
+	}()
+	if contentErr != nil && metadataErr == nil {
+		return metaresult, nil
 	}
+	if contentErr == nil && metadataErr == nil {
+		return CompositeResult(metaresult, contentResult), nil
+	}
+	return contentResult, contentErr
 }
 
 func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
diff --git a/app/dispatcher/fakednssniffer.go b/app/dispatcher/fakednssniffer.go
new file mode 100644
index 000000000..cab292551
--- /dev/null
+++ b/app/dispatcher/fakednssniffer.go
@@ -0,0 +1,51 @@
+// +build !confonly
+
+package dispatcher
+
+import (
+	"context"
+
+	"v2ray.com/core"
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
+	"v2ray.com/core/features/dns"
+)
+
+// newFakeDNSSniffer Create a Fake DNS metadata sniffer
+func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
+	var fakeDNSEngine dns.FakeDNSEngine
+	err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+		fakeDNSEngine = fdns
+	})
+	if err != nil {
+		return protocolSnifferWithMetadata{}, err
+	}
+	if fakeDNSEngine == nil {
+		errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
+		return protocolSnifferWithMetadata{}, errNotInit
+	}
+	return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
+		Target := session.OutboundFromContext(ctx).Target
+		if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP {
+			domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address)
+			if domainFromFakeDNS != "" {
+				newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx))
+				return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil
+			}
+		}
+		return nil, common.ErrNoClue
+	}, metadataSniffer: true}, nil
+}
+
+type fakeDNSSniffResult struct {
+	domainName string
+}
+
+func (fakeDNSSniffResult) Protocol() string {
+	return "fakedns"
+}
+
+func (f fakeDNSSniffResult) Domain() string {
+	return f.domainName
+}
diff --git a/app/dispatcher/sniffer.go b/app/dispatcher/sniffer.go
index 34851ab8b..613dc8eba 100644
--- a/app/dispatcher/sniffer.go
+++ b/app/dispatcher/sniffer.go
@@ -3,6 +3,8 @@
 package dispatcher
 
 import (
+	"context"
+
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/protocol/bittorrent"
 	"v2ray.com/core/common/protocol/http"
@@ -14,30 +16,46 @@ type SniffResult interface {
 	Domain() string
 }
 
-type protocolSniffer func([]byte) (SniffResult, error)
+type protocolSniffer func(context.Context, []byte) (SniffResult, error)
 
-type Sniffer struct {
-	sniffer []protocolSniffer
+type protocolSnifferWithMetadata struct {
+	protocolSniffer protocolSniffer
+	// A Metadata sniffer will be invoked on connection establishment only, with nil body,
+	// for both TCP and UDP connections
+	// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
+	metadataSniffer bool
 }
 
-func NewSniffer() *Sniffer {
-	return &Sniffer{
-		sniffer: []protocolSniffer{
-			func(b []byte) (SniffResult, error) { return http.SniffHTTP(b) },
-			func(b []byte) (SniffResult, error) { return tls.SniffTLS(b) },
-			func(b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) },
+type Sniffer struct {
+	sniffer []protocolSnifferWithMetadata
+}
+
+func NewSniffer(ctx context.Context) *Sniffer {
+	ret := &Sniffer{
+		sniffer: []protocolSnifferWithMetadata{
+			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
 		},
 	}
+	if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
+		ret.sniffer = append(ret.sniffer, sniffer)
+	}
+	return ret
 }
 
 var errUnknownContent = newError("unknown content")
 
-func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
-	var pendingSniffer []protocolSniffer
-	for _, s := range s.sniffer {
-		result, err := s(payload)
+func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if si.metadataSniffer {
+			continue
+		}
+		result, err := s(c, payload)
 		if err == common.ErrNoClue {
-			pendingSniffer = append(pendingSniffer, s)
+			pendingSniffer = append(pendingSniffer, si)
 			continue
 		}
 
@@ -53,3 +71,55 @@ func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
 
 	return nil, errUnknownContent
 }
+
+func (s *Sniffer) SniffMetadata(c context.Context) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if !si.metadataSniffer {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+		result, err := s(c, nil)
+		if err == common.ErrNoClue {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+
+		if err == nil && result != nil {
+			return result, nil
+		}
+	}
+
+	if len(pendingSniffer) > 0 {
+		s.sniffer = pendingSniffer
+		return nil, common.ErrNoClue
+	}
+
+	return nil, errUnknownContent
+}
+
+func CompositeResult(domainResult SniffResult, protocolResult SniffResult) SniffResult {
+	return &compositeResult{domainResult: domainResult, protocolResult: protocolResult}
+}
+
+type compositeResult struct {
+	domainResult   SniffResult
+	protocolResult SniffResult
+}
+
+func (c compositeResult) Protocol() string {
+	return c.protocolResult.Protocol()
+}
+
+func (c compositeResult) Domain() string {
+	return c.domainResult.Domain()
+}
+
+func (c compositeResult) ProtocolForDomainResult() string {
+	return c.domainResult.Protocol()
+}
+
+type SnifferResultComposite interface {
+	ProtocolForDomainResult() string
+}
diff --git a/app/dns/config.proto b/app/dns/config.proto
index cdce754aa..cba15eec4 100644
--- a/app/dns/config.proto
+++ b/app/dns/config.proto
@@ -69,4 +69,6 @@ message Config {
 
   // Tag is the inbound tag of DNS client.
   string tag = 6;
+
+  reserved 7;
 }
diff --git a/app/dns/dns.go b/app/dns/dns.go
index 0e135a1f2..8c0c5dfe2 100644
--- a/app/dns/dns.go
+++ b/app/dns/dns.go
@@ -23,10 +23,10 @@ import (
 // DNS is a DNS rely server.
 type DNS struct {
 	sync.Mutex
-	tag     string
-	hosts   *StaticHosts
-	clients []*Client
-
+	tag           string
+	hosts         *StaticHosts
+	clients       []*Client
+	ctx           context.Context
 	domainMatcher strmatcher.IndexMatcher
 	matcherInfos  []DomainMatcherInfo
 }
@@ -113,6 +113,7 @@ func New(ctx context.Context, config *Config) (*DNS, error) {
 		tag:           tag,
 		hosts:         hosts,
 		clients:       clients,
+		ctx:           ctx,
 		domainMatcher: domainMatcher,
 		matcherInfos:  matcherInfos,
 	}, nil
@@ -189,7 +190,7 @@ func (s *DNS) lookupIPInternal(domain string, option IPOption) ([]net.IP, error)
 
 	// Name servers lookup
 	errs := []error{}
-	ctx := session.ContextWithInbound(context.Background(), &session.Inbound{Tag: s.tag})
+	ctx := session.ContextWithInbound(s.ctx, &session.Inbound{Tag: s.tag})
 	for _, client := range s.sortClients(domain) {
 		ips, err := client.QueryIP(ctx, domain, option)
 		if len(ips) > 0 {
diff --git a/app/dns/fakedns/errors.generated.go b/app/dns/fakedns/errors.generated.go
new file mode 100644
index 000000000..c8ad60eda
--- /dev/null
+++ b/app/dns/fakedns/errors.generated.go
@@ -0,0 +1,9 @@
+package fakedns
+
+import "v2ray.com/core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}
diff --git a/app/dns/fakedns/fake.go b/app/dns/fakedns/fake.go
new file mode 100644
index 000000000..22ff3ceb1
--- /dev/null
+++ b/app/dns/fakedns/fake.go
@@ -0,0 +1,132 @@
+// +build !confonly
+
+package fakedns
+
+import (
+	"context"
+	"math"
+	"math/big"
+	gonet "net"
+
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/cache"
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/features/dns"
+)
+
+type Holder struct {
+	domainToIP cache.Lru
+	nextIP     *big.Int
+
+	ipRange *gonet.IPNet
+
+	config *FakeDnsPool
+}
+
+func (*Holder) Type() interface{} {
+	return (*dns.FakeDNSEngine)(nil)
+}
+
+func (fkdns *Holder) Start() error {
+	return fkdns.initializeFromConfig()
+}
+
+func (fkdns *Holder) Close() error {
+	fkdns.domainToIP = nil
+	fkdns.nextIP = nil
+	fkdns.ipRange = nil
+	return nil
+}
+
+func NewFakeDNSHolder() (*Holder, error) {
+	var fkdns *Holder
+	var err error
+
+	if fkdns, err = NewFakeDNSHolderConfigOnly(nil); err != nil {
+		return nil, newError("Unable to create Fake Dns Engine").Base(err).AtError()
+	}
+	err = fkdns.initialize("240.0.0.0/8", 65535)
+	if err != nil {
+		return nil, err
+	}
+	return fkdns, nil
+}
+
+func NewFakeDNSHolderConfigOnly(conf *FakeDnsPool) (*Holder, error) {
+	return &Holder{nil, nil, nil, conf}, nil
+}
+
+func (fkdns *Holder) initializeFromConfig() error {
+	return fkdns.initialize(fkdns.config.IpPool, int(fkdns.config.LruSize))
+}
+
+func (fkdns *Holder) initialize(ipPoolCidr string, lruSize int) error {
+	var ipRange *gonet.IPNet
+	var ipaddr gonet.IP
+	var currentIP *big.Int
+	var err error
+
+	if ipaddr, ipRange, err = gonet.ParseCIDR(ipPoolCidr); err != nil {
+		return newError("Unable to parse CIDR for Fake DNS IP assignment").Base(err).AtError()
+	}
+
+	currentIP = big.NewInt(0).SetBytes(ipaddr)
+	if ipaddr.To4() != nil {
+		currentIP = big.NewInt(0).SetBytes(ipaddr.To4())
+	}
+
+	ones, bits := ipRange.Mask.Size()
+	rooms := bits - ones
+	if math.Log2(float64(lruSize)) >= float64(rooms) {
+		return newError("LRU size is bigger than subnet size").AtError()
+	}
+	fkdns.domainToIP = cache.NewLru(lruSize)
+	fkdns.ipRange = ipRange
+	fkdns.nextIP = currentIP
+	return nil
+}
+
+// GetFakeIPForDomain check and generate a fake IP for a domain name
+func (fkdns *Holder) GetFakeIPForDomain(domain string) []net.Address {
+	if v, ok := fkdns.domainToIP.Get(domain); ok {
+		return []net.Address{v.(net.Address)}
+	}
+	var ip net.Address
+	for {
+		ip = net.IPAddress(fkdns.nextIP.Bytes())
+
+		fkdns.nextIP = fkdns.nextIP.Add(fkdns.nextIP, big.NewInt(1))
+		if !fkdns.ipRange.Contains(fkdns.nextIP.Bytes()) {
+			fkdns.nextIP = big.NewInt(0).SetBytes(fkdns.ipRange.IP)
+		}
+
+		// if we run for a long time, we may go back to beginning and start seeing the IP in use
+		if _, ok := fkdns.domainToIP.GetKeyFromValue(ip); !ok {
+			break
+		}
+	}
+	fkdns.domainToIP.Put(domain, ip)
+	return []net.Address{ip}
+}
+
+// GetDomainFromFakeDNS check if an IP is a fake IP and have corresponding domain name
+func (fkdns *Holder) GetDomainFromFakeDNS(ip net.Address) string {
+	if !ip.Family().IsIP() || !fkdns.ipRange.Contains(ip.IP()) {
+		return ""
+	}
+	if k, ok := fkdns.domainToIP.GetKeyFromValue(ip); ok {
+		return k.(string)
+	}
+	return ""
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*FakeDnsPool)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		var f *Holder
+		var err error
+		if f, err = NewFakeDNSHolderConfigOnly(config.(*FakeDnsPool)); err != nil {
+			return nil, err
+		}
+		return f, nil
+	}))
+}
diff --git a/app/dns/fakedns/fakedns.go b/app/dns/fakedns/fakedns.go
new file mode 100644
index 000000000..0e55e5bd5
--- /dev/null
+++ b/app/dns/fakedns/fakedns.go
@@ -0,0 +1,5 @@
+// +build !confonly
+
+package fakedns
+
+//go:generate go run v2ray.com/core/common/errors/errorgen
diff --git a/app/dns/fakedns/fakedns.pb.go b/app/dns/fakedns/fakedns.pb.go
new file mode 100644
index 000000000..1ed892ef9
--- /dev/null
+++ b/app/dns/fakedns/fakedns.pb.go
@@ -0,0 +1,164 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.13.0
+// source: app/dns/fakedns/fakedns.proto
+
+package fakedns
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type FakeDnsPool struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IpPool  string `protobuf:"bytes,1,opt,name=ip_pool,json=ipPool,proto3" json:"ip_pool,omitempty"` //CIDR of IP pool used as fake DNS IP
+	LruSize int64  `protobuf:"varint,2,opt,name=lruSize,proto3" json:"lruSize,omitempty"`            //Size of Pool for remembering relationship between domain name and IP address
+}
+
+func (x *FakeDnsPool) Reset() {
+	*x = FakeDnsPool{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FakeDnsPool) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FakeDnsPool) ProtoMessage() {}
+
+func (x *FakeDnsPool) ProtoReflect() protoreflect.Message {
+	mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FakeDnsPool.ProtoReflect.Descriptor instead.
+func (*FakeDnsPool) Descriptor() ([]byte, []int) {
+	return file_app_dns_fakedns_fakedns_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *FakeDnsPool) GetIpPool() string {
+	if x != nil {
+		return x.IpPool
+	}
+	return ""
+}
+
+func (x *FakeDnsPool) GetLruSize() int64 {
+	if x != nil {
+		return x.LruSize
+	}
+	return 0
+}
+
+var File_app_dns_fakedns_fakedns_proto protoreflect.FileDescriptor
+
+var file_app_dns_fakedns_fakedns_proto_rawDesc = []byte{
+	0x0a, 0x1d, 0x61, 0x70, 0x70, 0x2f, 0x64, 0x6e, 0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e,
+	0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x1a, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61, 0x70, 0x70, 0x2e,
+	0x64, 0x6e, 0x73, 0x2e, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x22, 0x40, 0x0a, 0x0b, 0x46,
+	0x61, 0x6b, 0x65, 0x44, 0x6e, 0x73, 0x50, 0x6f, 0x6f, 0x6c, 0x12, 0x17, 0x0a, 0x07, 0x69, 0x70,
+	0x5f, 0x70, 0x6f, 0x6f, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x69, 0x70, 0x50,
+	0x6f, 0x6f, 0x6c, 0x12, 0x18, 0x0a, 0x07, 0x6c, 0x72, 0x75, 0x53, 0x69, 0x7a, 0x65, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x03, 0x52, 0x07, 0x6c, 0x72, 0x75, 0x53, 0x69, 0x7a, 0x65, 0x42, 0x5f, 0x0a,
+	0x1e, 0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e,
+	0x61, 0x70, 0x70, 0x2e, 0x64, 0x6e, 0x73, 0x2e, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x50,
+	0x01, 0x5a, 0x1e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x72,
+	0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x64, 0x6e, 0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e,
+	0x73, 0xaa, 0x02, 0x1a, 0x56, 0x32, 0x52, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x41,
+	0x70, 0x70, 0x2e, 0x44, 0x6e, 0x73, 0x2e, 0x46, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_dns_fakedns_fakedns_proto_rawDescOnce sync.Once
+	file_app_dns_fakedns_fakedns_proto_rawDescData = file_app_dns_fakedns_fakedns_proto_rawDesc
+)
+
+func file_app_dns_fakedns_fakedns_proto_rawDescGZIP() []byte {
+	file_app_dns_fakedns_fakedns_proto_rawDescOnce.Do(func() {
+		file_app_dns_fakedns_fakedns_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_dns_fakedns_fakedns_proto_rawDescData)
+	})
+	return file_app_dns_fakedns_fakedns_proto_rawDescData
+}
+
+var file_app_dns_fakedns_fakedns_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_app_dns_fakedns_fakedns_proto_goTypes = []interface{}{
+	(*FakeDnsPool)(nil), // 0: v2ray.core.app.dns.fakedns.FakeDnsPool
+}
+var file_app_dns_fakedns_fakedns_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_app_dns_fakedns_fakedns_proto_init() }
+func file_app_dns_fakedns_fakedns_proto_init() {
+	if File_app_dns_fakedns_fakedns_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_dns_fakedns_fakedns_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FakeDnsPool); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_dns_fakedns_fakedns_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_dns_fakedns_fakedns_proto_goTypes,
+		DependencyIndexes: file_app_dns_fakedns_fakedns_proto_depIdxs,
+		MessageInfos:      file_app_dns_fakedns_fakedns_proto_msgTypes,
+	}.Build()
+	File_app_dns_fakedns_fakedns_proto = out.File
+	file_app_dns_fakedns_fakedns_proto_rawDesc = nil
+	file_app_dns_fakedns_fakedns_proto_goTypes = nil
+	file_app_dns_fakedns_fakedns_proto_depIdxs = nil
+}
diff --git a/app/dns/fakedns/fakedns.proto b/app/dns/fakedns/fakedns.proto
new file mode 100644
index 000000000..9f64b3863
--- /dev/null
+++ b/app/dns/fakedns/fakedns.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package v2ray.core.app.dns.fakedns;
+option csharp_namespace = "V2Ray.Core.App.Dns.Fakedns";
+option go_package = "v2ray.com/core/app/dns/fakedns";
+option java_package = "com.v2ray.core.app.dns.fakedns";
+option java_multiple_files = true;
+
+message FakeDnsPool{
+  string ip_pool = 1; //CIDR of IP pool used as fake DNS IP
+  int64  lruSize = 2; //Size of Pool for remembering relationship between domain name and IP address
+}
\ No newline at end of file
diff --git a/app/dns/fakedns/fakedns_test.go b/app/dns/fakedns/fakedns_test.go
new file mode 100644
index 000000000..8484b0c2b
--- /dev/null
+++ b/app/dns/fakedns/fakedns_test.go
@@ -0,0 +1,114 @@
+package fakedns
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/uuid"
+)
+
+func TestNewFakeDnsHolder(_ *testing.T) {
+	_, err := NewFakeDNSHolder()
+	common.Must(err)
+}
+
+func TestFakeDnsHolderCreateMapping(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+	assert.Equal(t, "240.0.0.0", addr[0].IP().String())
+}
+
+func TestFakeDnsHolderCreateMappingMany(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+	assert.Equal(t, "240.0.0.0", addr[0].IP().String())
+
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
+	assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
+}
+
+func TestFakeDnsHolderCreateMappingManyAndResolve(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	{
+		addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+		assert.Equal(t, "240.0.0.0", addr[0].IP().String())
+	}
+
+	{
+		addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
+		assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
+	}
+
+	{
+		result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.0"))
+		assert.Equal(t, "fakednstest.v2fly.org", result)
+	}
+
+	{
+		result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.1"))
+		assert.Equal(t, "fakednstest2.v2fly.org", result)
+	}
+}
+
+func TestFakeDnsHolderCreateMappingManySingleDomain(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+	assert.Equal(t, "240.0.0.0", addr[0].IP().String())
+
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+	assert.Equal(t, "240.0.0.0", addr2[0].IP().String())
+}
+
+func TestFakeDnsHolderCreateMappingAndRollOver(t *testing.T) {
+	fkdns, err := NewFakeDNSHolderConfigOnly(&FakeDnsPool{
+		IpPool:  "240.0.0.0/12",
+		LruSize: 256,
+	})
+	common.Must(err)
+
+	err = fkdns.Start()
+
+	common.Must(err)
+
+	{
+		addr := fkdns.GetFakeIPForDomain("fakednstest.v2fly.org")
+		assert.Equal(t, "240.0.0.0", addr[0].IP().String())
+	}
+
+	{
+		addr2 := fkdns.GetFakeIPForDomain("fakednstest2.v2fly.org")
+		assert.Equal(t, "240.0.0.1", addr2[0].IP().String())
+	}
+
+	for i := 0; i <= 8192; i++ {
+		{
+			result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.0"))
+			assert.Equal(t, "fakednstest.v2fly.org", result)
+		}
+
+		{
+			result := fkdns.GetDomainFromFakeDNS(net.ParseAddress("240.0.0.1"))
+			assert.Equal(t, "fakednstest2.v2fly.org", result)
+		}
+
+		{
+			uuid := uuid.New()
+			domain := uuid.String() + ".fakednstest.v2fly.org"
+			addr := fkdns.GetFakeIPForDomain(domain)
+			rsaddr := addr[0].IP().String()
+
+			result := fkdns.GetDomainFromFakeDNS(net.ParseAddress(rsaddr))
+			assert.Equal(t, domain, result)
+		}
+	}
+}
diff --git a/app/dns/nameserver.go b/app/dns/nameserver.go
index bbc1bdd1b..22aab78e5 100644
--- a/app/dns/nameserver.go
+++ b/app/dns/nameserver.go
@@ -55,6 +55,8 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
 			return NewDoHLocalNameServer(u), nil
 		case u.Scheme == "quic+local": // DNS-over-QUIC Local mode
 			return NewQUICNameServer(u)
+		case u.String() == "fakedns":
+			return NewFakeDNSServer(), nil
 		}
 	}
 	if dest.Network == net.Network_Unknown {
diff --git a/app/dns/nameserver_fakedns.go b/app/dns/nameserver_fakedns.go
new file mode 100644
index 000000000..9fa01b4b1
--- /dev/null
+++ b/app/dns/nameserver_fakedns.go
@@ -0,0 +1,41 @@
+// +build !confonly
+
+package dns
+
+import (
+	"context"
+
+	"v2ray.com/core"
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/features/dns"
+)
+
+type FakeDNSServer struct {
+	fakeDNSEngine dns.FakeDNSEngine
+}
+
+func NewFakeDNSServer() *FakeDNSServer {
+	return &FakeDNSServer{}
+}
+
+func (FakeDNSServer) Name() string {
+	return "FakeDNS"
+}
+
+func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _ IPOption) ([]net.IP, error) {
+	if f.fakeDNSEngine == nil {
+		if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
+			f.fakeDNSEngine = fd
+		}); err != nil {
+			return nil, newError("Unable to locate a fake DNS Engine").Base(err).AtError()
+		}
+	}
+	ips := f.fakeDNSEngine.GetFakeIPForDomain(domain)
+
+	netIP, err := toNetIP(ips)
+	if err != nil {
+		return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
+	}
+
+	return netIP, nil
+}
diff --git a/app/proxyman/config.pb.go b/app/proxyman/config.pb.go
index ce670a283..476e43afd 100644
--- a/app/proxyman/config.pb.go
+++ b/app/proxyman/config.pb.go
@@ -239,8 +239,11 @@ type SniffingConfig struct {
 	// Whether or not to enable content sniffing on an inbound connection.
 	Enabled bool `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
 	// Override target destination if sniff'ed protocol is in the given list.
-	// Supported values are "http", "tls".
+	// Supported values are "http", "tls", "fakedns".
 	DestinationOverride []string `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
+	// Whether should only try to sniff metadata without waiting for client input.
+	// Can be used to support SMTP like protocol where server send the first message.
+	MetadataOnly bool `protobuf:"varint,3,opt,name=metadata_only,json=metadataOnly,proto3" json:"metadata_only,omitempty"`
 }
 
 func (x *SniffingConfig) Reset() {
@@ -289,6 +292,13 @@ func (x *SniffingConfig) GetDestinationOverride() []string {
 	return nil
 }
 
+func (x *SniffingConfig) GetMetadataOnly() bool {
+	if x != nil {
+		return x.MetadataOnly
+	}
+	return false
+}
+
 type ReceiverConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -757,97 +767,99 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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+	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x0e, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x53, 0x65,
+	0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x51, 0x0a, 0x0e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x5f,
+	0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x2a,
+	0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x74, 0x72, 0x61, 0x6e,
+	0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x50,
+	0x72, 0x6f, 0x78, 0x79, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x0d, 0x70, 0x72, 0x6f, 0x78,
+	0x79, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x5a, 0x0a, 0x12, 0x6d, 0x75, 0x6c,
+	0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x18,
+	0x04, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x2b, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f,
+	0x72, 0x65, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x2e,
+	0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66,
+	0x69, 0x67, 0x52, 0x11, 0x6d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x53, 0x65, 0x74,
+	0x74, 0x69, 0x6e, 0x67, 0x73, 0x22, 0x50, 0x0a, 0x12, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c,
+	0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65,
+	0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e,
+	0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x20, 0x0a, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72,
+	0x65, 0x6e, 0x63, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x0b, 0x63, 0x6f, 0x6e, 0x63,
+	0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x2a, 0x23, 0x0a, 0x0e, 0x4b, 0x6e, 0x6f, 0x77, 0x6e,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x73, 0x12, 0x08, 0x0a, 0x04, 0x48, 0x54, 0x54,
+	0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x54, 0x4c, 0x53, 0x10, 0x01, 0x42, 0x56, 0x0a, 0x1b,
+	0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61,
+	0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x50, 0x01, 0x5a, 0x1b, 0x76,
+	0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70,
+	0x70, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0xaa, 0x02, 0x17, 0x56, 0x32, 0x52,
+	0x61, 0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x50, 0x72, 0x6f, 0x78,
+	0x79, 0x6d, 0x61, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/app/proxyman/config.proto b/app/proxyman/config.proto
index 7f4b7b8d2..ca9e625c0 100644
--- a/app/proxyman/config.proto
+++ b/app/proxyman/config.proto
@@ -54,8 +54,12 @@ message SniffingConfig {
   bool enabled = 1;
 
   // Override target destination if sniff'ed protocol is in the given list.
-  // Supported values are "http", "tls".
+  // Supported values are "http", "tls", "fakedns".
   repeated string destination_override = 2;
+
+  // Whether should only try to sniff metadata without waiting for client input.
+  // Can be used to support SMTP like protocol where server send the first message.
+  bool metadata_only = 3;
 }
 
 message ReceiverConfig {
diff --git a/app/proxyman/inbound/always.go b/app/proxyman/inbound/always.go
index f44747bd9..33014416c 100644
--- a/app/proxyman/inbound/always.go
+++ b/app/proxyman/inbound/always.go
@@ -128,11 +128,13 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 
 			if net.HasNetwork(nl, net.Network_UDP) {
 				worker := &udpWorker{
+					ctx:             ctx,
 					tag:             tag,
 					proxy:           p,
 					address:         address,
 					port:            net.Port(port),
 					dispatcher:      h.mux,
+					sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
 					uplinkCounter:   uplinkCounter,
 					downlinkCounter: downlinkCounter,
 					stream:          mss,
diff --git a/app/proxyman/inbound/dynamic.go b/app/proxyman/inbound/dynamic.go
index 3dbd89abe..f20920699 100644
--- a/app/proxyman/inbound/dynamic.go
+++ b/app/proxyman/inbound/dynamic.go
@@ -148,11 +148,13 @@ func (h *DynamicInboundHandler) refresh() error {
 
 		if net.HasNetwork(nl, net.Network_UDP) {
 			worker := &udpWorker{
+				ctx:             h.ctx,
 				tag:             h.tag,
 				proxy:           p,
 				address:         address,
 				port:            port,
 				dispatcher:      h.mux,
+				sniffingConfig:  h.receiverConfig.GetEffectiveSniffingSettings(),
 				uplinkCounter:   uplinkCounter,
 				downlinkCounter: downlinkCounter,
 				stream:          h.streamSettings,
diff --git a/app/proxyman/inbound/worker.go b/app/proxyman/inbound/worker.go
index 16e15aa8f..38f86910d 100644
--- a/app/proxyman/inbound/worker.go
+++ b/app/proxyman/inbound/worker.go
@@ -87,6 +87,7 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 	if w.uplinkCounter != nil || w.downlinkCounter != nil {
@@ -230,11 +231,14 @@ type udpWorker struct {
 	tag             string
 	stream          *internet.MemoryStreamConfig
 	dispatcher      routing.Dispatcher
+	sniffingConfig  *proxyman.SniffingConfig
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 
 	checker    *task.Periodic
 	activeConn map[connID]*udpConn
+
+	ctx context.Context
 }
 
 func (w *udpWorker) getConnection(id connID) (*udpConn, bool) {
@@ -286,7 +290,7 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 		common.Must(w.checker.Start())
 
 		go func() {
-			ctx := context.Background()
+			ctx := w.ctx
 			sid := session.NewID()
 			ctx = session.ContextWithID(ctx, sid)
 
@@ -300,6 +304,13 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 				Gateway: net.UDPDestination(w.address, w.port),
 				Tag:     w.tag,
 			})
+			content := new(session.Content)
+			if w.sniffingConfig != nil {
+				content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
+				content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+				content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
+			}
+			ctx = session.ContextWithContent(ctx, content)
 			if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
 				newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			}
@@ -428,6 +439,7 @@ func (w *dsWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 	if w.uplinkCounter != nil || w.downlinkCounter != nil {
diff --git a/common/cache/lru.go b/common/cache/lru.go
new file mode 100644
index 000000000..2594a8b1b
--- /dev/null
+++ b/common/cache/lru.go
@@ -0,0 +1,76 @@
+package cache
+
+import (
+	"container/list"
+	sync "sync"
+)
+
+// Lru simple, fast lru cache implementation
+type Lru interface {
+	Get(key interface{}) (value interface{}, ok bool)
+	GetKeyFromValue(value interface{}) (key interface{}, ok bool)
+	Put(key, value interface{})
+}
+
+type lru struct {
+	capacity         int
+	doubleLinkedlist *list.List
+	keyToElement     *sync.Map
+	valueToElement   *sync.Map
+	mu               *sync.Mutex
+}
+
+type lruElement struct {
+	key   interface{}
+	value interface{}
+}
+
+// NewLru init a lru cache
+func NewLru(cap int) Lru {
+	return lru{
+		capacity:         cap,
+		doubleLinkedlist: list.New(),
+		keyToElement:     new(sync.Map),
+		valueToElement:   new(sync.Map),
+		mu:               new(sync.Mutex),
+	}
+}
+
+func (l lru) Get(key interface{}) (value interface{}, ok bool) {
+	if v, ok := l.keyToElement.Load(key); ok {
+		element := v.(*list.Element)
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+		return element.Value.(lruElement).value, true
+	}
+	return nil, false
+}
+
+func (l lru) GetKeyFromValue(value interface{}) (key interface{}, ok bool) {
+	if k, ok := l.valueToElement.Load(value); ok {
+		element := k.(*list.Element)
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+		return element.Value.(lruElement).key, true
+	}
+	return nil, false
+}
+
+func (l lru) Put(key, value interface{}) {
+	e := lruElement{key, value}
+	if v, ok := l.keyToElement.Load(key); ok {
+		element := v.(*list.Element)
+		element.Value = e
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+	} else {
+		l.mu.Lock()
+		element := l.doubleLinkedlist.PushFront(e)
+		l.keyToElement.Store(key, element)
+		l.valueToElement.Store(value, element)
+		if l.doubleLinkedlist.Len() > l.capacity {
+			toBeRemove := l.doubleLinkedlist.Back()
+			l.doubleLinkedlist.Remove(toBeRemove)
+			l.keyToElement.Delete(toBeRemove.Value.(lruElement).key)
+			l.valueToElement.Delete(toBeRemove.Value.(lruElement).value)
+		}
+		l.mu.Unlock()
+	}
+}
diff --git a/common/cache/lru_test.go b/common/cache/lru_test.go
new file mode 100644
index 000000000..e2bb767f6
--- /dev/null
+++ b/common/cache/lru_test.go
@@ -0,0 +1,69 @@
+package cache_test
+
+import (
+	"testing"
+
+	. "v2ray.com/core/common/cache"
+)
+
+func TestLruReplaceValue(t *testing.T) {
+	lru := NewLru(2)
+	lru.Put(2, 6)
+	lru.Put(1, 5)
+	lru.Put(1, 2)
+	v, _ := lru.Get(1)
+	if v != 2 {
+		t.Error("should get 2", v)
+	}
+	v, _ = lru.Get(2)
+	if v != 6 {
+		t.Error("should get 6", v)
+	}
+}
+
+func TestLruRemoveOld(t *testing.T) {
+	lru := NewLru(2)
+	v, ok := lru.Get(2)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	lru.Put(1, 1)
+	lru.Put(2, 2)
+	v, _ = lru.Get(1)
+	if v != 1 {
+		t.Error("should get 1", v)
+	}
+	lru.Put(3, 3)
+	v, ok = lru.Get(2)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	lru.Put(4, 4)
+	v, ok = lru.Get(1)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	v, _ = lru.Get(3)
+	if v != 3 {
+		t.Error("should get 3", v)
+	}
+	v, _ = lru.Get(4)
+	if v != 4 {
+		t.Error("should get 4", v)
+	}
+}
+
+func TestGetKeyFromValue(t *testing.T) {
+	lru := NewLru(2)
+	lru.Put(3, 3)
+	lru.Put(2, 2)
+	lru.Put(1, 1)
+	v, ok := lru.GetKeyFromValue(3)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	v, _ = lru.GetKeyFromValue(2)
+	if v != 2 {
+		t.Error("should get 2", v)
+	}
+}
diff --git a/common/session/session.go b/common/session/session.go
index 463ebac80..2b67e2baa 100644
--- a/common/session/session.go
+++ b/common/session/session.go
@@ -57,6 +57,7 @@ type Outbound struct {
 type SniffingRequest struct {
 	OverrideDestinationForProtocol []string
 	Enabled                        bool
+	MetadataOnly                   bool
 }
 
 // Content is the metadata of the connection content.
diff --git a/features/dns/fakedns.go b/features/dns/fakedns.go
new file mode 100644
index 000000000..0206d8307
--- /dev/null
+++ b/features/dns/fakedns.go
@@ -0,0 +1,12 @@
+package dns
+
+import (
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/features"
+)
+
+type FakeDNSEngine interface {
+	features.Feature
+	GetFakeIPForDomain(domain string) []net.Address
+	GetDomainFromFakeDNS(ip net.Address) string
+}
diff --git a/features/dns/localdns/errors.generated.go b/features/dns/localdns/errors.generated.go
new file mode 100644
index 000000000..c63727c75
--- /dev/null
+++ b/features/dns/localdns/errors.generated.go
@@ -0,0 +1,9 @@
+package localdns
+
+import "v2ray.com/core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}
diff --git a/infra/conf/fakedns.go b/infra/conf/fakedns.go
new file mode 100644
index 000000000..d731bed56
--- /dev/null
+++ b/infra/conf/fakedns.go
@@ -0,0 +1,65 @@
+package conf
+
+import (
+	"github.com/golang/protobuf/proto"
+	"v2ray.com/core/app/dns/fakedns"
+)
+
+type FakeDNSConfig struct {
+	IPPool  string `json:"ipPool"`
+	LruSize int64  `json:"poolSize"`
+}
+
+func (f FakeDNSConfig) Build() (proto.Message, error) {
+	return &fakedns.FakeDnsPool{
+		IpPool:  f.IPPool,
+		LruSize: f.LruSize,
+	}, nil
+}
+
+type FakeDNSPostProcessingStage struct{}
+
+func (FakeDNSPostProcessingStage) Process(conf *Config) error {
+	var fakeDNSInUse bool
+
+	if conf.DNSConfig != nil {
+		for _, v := range conf.DNSConfig.Servers {
+			if v.Address.Family().IsDomain() {
+				if v.Address.Domain() == "fakedns" {
+					fakeDNSInUse = true
+				}
+			}
+		}
+	}
+
+	if fakeDNSInUse {
+		if conf.FakeDNS == nil {
+			// Add a Fake DNS Config if there is none
+			conf.FakeDNS = &FakeDNSConfig{
+				IPPool:  "240.0.0.0/8",
+				LruSize: 65535,
+			}
+		}
+		found := false
+		// Check if there is a Outbound with necessary sniffer on
+		var inbounds []InboundDetourConfig
+
+		if len(conf.InboundConfigs) > 0 {
+			inbounds = append(inbounds, conf.InboundConfigs...)
+		}
+		for _, v := range inbounds {
+			if v.SniffingConfig != nil && v.SniffingConfig.Enabled && v.SniffingConfig.DestOverride != nil {
+				for _, dov := range *v.SniffingConfig.DestOverride {
+					if dov == "fakedns" {
+						found = true
+					}
+				}
+			}
+		}
+		if !found {
+			newError("Defined Fake DNS but haven't enabled fake dns sniffing at any inbound.").AtWarning().WriteToLog()
+		}
+	}
+
+	return nil
+}
diff --git a/infra/conf/init.go b/infra/conf/init.go
new file mode 100644
index 000000000..519d9fb25
--- /dev/null
+++ b/infra/conf/init.go
@@ -0,0 +1,5 @@
+package conf
+
+func init() {
+	RegisterConfigureFilePostProcessingStage("FakeDNS", &FakeDNSPostProcessingStage{})
+}
diff --git a/infra/conf/lint.go b/infra/conf/lint.go
new file mode 100644
index 000000000..93da35d40
--- /dev/null
+++ b/infra/conf/lint.go
@@ -0,0 +1,23 @@
+package conf
+
+type ConfigureFilePostProcessingStage interface {
+	Process(conf *Config) error
+}
+
+var configureFilePostProcessingStages map[string]ConfigureFilePostProcessingStage
+
+func RegisterConfigureFilePostProcessingStage(name string, stage ConfigureFilePostProcessingStage) {
+	if configureFilePostProcessingStages == nil {
+		configureFilePostProcessingStages = make(map[string]ConfigureFilePostProcessingStage)
+	}
+	configureFilePostProcessingStages[name] = stage
+}
+
+func PostProcessConfigureFile(conf *Config) error {
+	for k, v := range configureFilePostProcessingStages {
+		if err := v.Process(conf); err != nil {
+			return newError("Rejected by Postprocessing Stage ", k).AtError().Base(err)
+		}
+	}
+	return nil
+}
diff --git a/infra/conf/v2ray.go b/infra/conf/v2ray.go
index 5ae3aa3bb..390058992 100644
--- a/infra/conf/v2ray.go
+++ b/infra/conf/v2ray.go
@@ -59,6 +59,7 @@ func toProtocolList(s []string) ([]proxyman.KnownProtocols, error) {
 type SniffingConfig struct {
 	Enabled      bool        `json:"enabled"`
 	DestOverride *StringList `json:"destOverride"`
+	MetadataOnly bool        `json:"metadataOnly"`
 }
 
 // Build implements Buildable.
@@ -71,6 +72,8 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 				p = append(p, "http")
 			case "tls", "https", "ssl":
 				p = append(p, "tls")
+			case "fakedns":
+				p = append(p, "fakedns")
 			default:
 				return nil, newError("unknown protocol: ", domainOverride)
 			}
@@ -80,6 +83,7 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 	return &proxyman.SniffingConfig{
 		Enabled:             c.Enabled,
 		DestinationOverride: p,
+		MetadataOnly:        c.MetadataOnly,
 	}, nil
 }
 
@@ -346,6 +350,7 @@ type Config struct {
 	API             *APIConfig             `json:"api"`
 	Stats           *StatsConfig           `json:"stats"`
 	Reverse         *ReverseConfig         `json:"reverse"`
+	FakeDNS         *FakeDNSConfig         `json:"fakeDns"`
 }
 
 func (c *Config) findInboundTag(tag string) int {
@@ -399,6 +404,10 @@ func (c *Config) Override(o *Config, fn string) {
 		c.Reverse = o.Reverse
 	}
 
+	if o.FakeDNS != nil {
+		c.FakeDNS = o.FakeDNS
+	}
+
 	// deprecated attrs... keep them for now
 	if o.InboundConfig != nil {
 		c.InboundConfig = o.InboundConfig
@@ -470,6 +479,10 @@ func applyTransportConfig(s *StreamConfig, t *TransportConfig) {
 
 // Build implements Buildable.
 func (c *Config) Build() (*core.Config, error) {
+	if err := PostProcessConfigureFile(c); err != nil {
+		return nil, err
+	}
+
 	config := &core.Config{
 		App: []*serial.TypedMessage{
 			serial.ToTypedMessage(&dispatcher.Config{}),
@@ -536,6 +549,14 @@ func (c *Config) Build() (*core.Config, error) {
 		config.App = append(config.App, serial.ToTypedMessage(r))
 	}
 
+	if c.FakeDNS != nil {
+		r, err := c.FakeDNS.Build()
+		if err != nil {
+			return nil, err
+		}
+		config.App = append(config.App, serial.ToTypedMessage(r))
+	}
+
 	var inbounds []InboundDetourConfig
 
 	if c.InboundConfig != nil {
diff --git a/main/distro/all/all.go b/main/distro/all/all.go
index f7ae90eb7..afacd2a94 100644
--- a/main/distro/all/all.go
+++ b/main/distro/all/all.go
@@ -16,6 +16,7 @@ import (
 
 	// Other optional features.
 	_ "v2ray.com/core/app/dns"
+	_ "v2ray.com/core/app/dns/fakedns"
 	_ "v2ray.com/core/app/log"
 	_ "v2ray.com/core/app/policy"
 	_ "v2ray.com/core/app/reverse"
diff --git a/proxy/dns/dns.go b/proxy/dns/dns.go
index 4117c0c36..cb3376870 100644
--- a/proxy/dns/dns.go
+++ b/proxy/dns/dns.go
@@ -38,6 +38,7 @@ type ownLinkVerifier interface {
 }
 
 type Handler struct {
+	client          dns.Client
 	ipv4Lookup      dns.IPv4Lookup
 	ipv6Lookup      dns.IPv6Lookup
 	ownLinkVerifier ownLinkVerifier
@@ -45,6 +46,7 @@ type Handler struct {
 }
 
 func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
+	h.client = dnsClient
 	ipv4lookup, ok := dnsClient.(dns.IPv4Lookup)
 	if !ok {
 		return newError("dns.Client doesn't implement IPv4Lookup")
@@ -211,6 +213,8 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	var ips []net.IP
 	var err error
 
+	var ttl uint32 = 600
+
 	switch qType {
 	case dnsmessage.TypeA:
 		ips, err = h.ipv4Lookup.LookupIPv4(domain)
@@ -243,7 +247,7 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	}))
 	common.Must(builder.StartAnswers())
 
-	rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: 600}
+	rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: ttl}
 	for _, ip := range ips {
 		if len(ip) == net.IPv4len {
 			var r dnsmessage.AResource