diff --git a/encoding/ssh/filexfer/extended_packets.go b/encoding/ssh/filexfer/extended_packets.go
new file mode 100644
index 0000000..6646f44
--- /dev/null
+++ b/encoding/ssh/filexfer/extended_packets.go
@@ -0,0 +1,151 @@
+package filexfer
+
+import (
+	"encoding"
+)
+
+// ExtendedData aliases the untyped interface composition of encoding.BinaryMarshaler and encoding.BinaryUnmarshaler.
+type ExtendedData = interface {
+	encoding.BinaryMarshaler
+	encoding.BinaryUnmarshaler
+}
+
+// ExtendedPacket defines the SSH_FXP_CLOSE packet.
+type ExtendedPacket struct {
+	RequestID       uint32
+	ExtendedRequest string
+
+	Data ExtendedData
+}
+
+// MarshalPacket returns p as a two-part binary encoding of p.
+//
+// The Data is marshaled into binary, and returned as the payload.
+func (p *ExtendedPacket) MarshalPacket() (header, payload []byte, err error) {
+	size := 1 + 4 + // byte(type) + uint32(request-id)
+		4 + len(p.ExtendedRequest) // string(extended-request)
+
+	b := NewMarshalBuffer(size)
+	b.AppendUint8(uint8(PacketTypeExtended))
+	b.AppendUint32(p.RequestID)
+
+	b.AppendString(p.ExtendedRequest)
+
+	if p.Data != nil {
+		payload, err = p.Data.MarshalBinary()
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	b.PutLength(size + len(payload))
+
+	return b.Bytes(), payload, nil
+}
+
+// MarshalBinary returns p as the binary encoding of p.
+func (p *ExtendedPacket) MarshalBinary() ([]byte, error) {
+	return ComposePacket(p.MarshalPacket())
+}
+
+// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
+// It is assumed that the uint32(request-id) has already been consumed.
+//
+// If p.Data is nil, and there is request-specific-data,
+// then the request-specific-data will be wrapped in a Buffer and assigned to p.Data.
+func (p *ExtendedPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
+	if p.ExtendedRequest, err = buf.ConsumeString(); err != nil {
+		return err
+	}
+
+	if buf.Len() > 0 {
+		if p.Data == nil {
+			p.Data = new(Buffer)
+		}
+
+		if err := p.Data.UnmarshalBinary(buf.Bytes()); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// UnmarshalBinary unmarshals a full raw packet out of the given data.
+// It is assumed that the uint32(length) has already been consumed to receive the data.
+// It is also assumed that the uint8(type) has already been consumed to which packet to unmarshal into.
+func (p *ExtendedPacket) UnmarshalBinary(data []byte) (err error) {
+	buf := NewBuffer(data)
+
+	if p.RequestID, err = buf.ConsumeUint32(); err != nil {
+		return err
+	}
+
+	return p.UnmarshalPacketBody(buf)
+}
+
+// ExtendedReplyPacket defines the SSH_FXP_CLOSE packet.
+type ExtendedReplyPacket struct {
+	RequestID uint32
+
+	Data ExtendedData
+}
+
+// MarshalPacket returns p as a two-part binary encoding of p.
+//
+// The Data is marshaled into binary, and returned as the payload.
+func (p *ExtendedReplyPacket) MarshalPacket() (header, payload []byte, err error) {
+	size := 1 + 4 // byte(type) + uint32(request-id)
+
+	b := NewMarshalBuffer(size)
+	b.AppendUint8(uint8(PacketTypeExtendedReply))
+	b.AppendUint32(p.RequestID)
+
+	if p.Data != nil {
+		payload, err = p.Data.MarshalBinary()
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	b.PutLength(size + len(payload))
+
+	return b.Bytes(), payload, nil
+}
+
+// MarshalBinary returns p as the binary encoding of p.
+func (p *ExtendedReplyPacket) MarshalBinary() ([]byte, error) {
+	return ComposePacket(p.MarshalPacket())
+}
+
+// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
+// It is assumed that the uint32(request-id) has already been consumed.
+//
+// If p.Data is nil, and there is request-specific-data,
+// then the request-specific-data will be wrapped in a Buffer and assigned to p.Data.
+func (p *ExtendedReplyPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
+	if buf.Len() > 0 {
+		if p.Data == nil {
+			p.Data = new(Buffer)
+		}
+
+		if err := p.Data.UnmarshalBinary(buf.Bytes()); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// UnmarshalBinary unmarshals a full raw packet out of the given data.
+// It is assumed that the uint32(length) has already been consumed to receive the data.
+// It is also assumed that the uint8(type) has already been consumed to which packet to unmarshal into.
+func (p *ExtendedReplyPacket) UnmarshalBinary(data []byte) (err error) {
+	buf := NewBuffer(data)
+
+	if p.RequestID, err = buf.ConsumeUint32(); err != nil {
+		return err
+	}
+
+	return p.UnmarshalPacketBody(buf)
+}
diff --git a/encoding/ssh/filexfer/extended_packets_test.go b/encoding/ssh/filexfer/extended_packets_test.go
new file mode 100644
index 0000000..e9ca94d
--- /dev/null
+++ b/encoding/ssh/filexfer/extended_packets_test.go
@@ -0,0 +1,265 @@
+package filexfer
+
+import (
+	"bytes"
+	"testing"
+)
+
+type testExtendedData struct {
+	value uint8
+}
+
+func (d *testExtendedData) MarshalBinary() ([]byte, error) {
+	buf := NewBuffer(make([]byte, 0, 4))
+
+	buf.AppendUint8(d.value ^ 0x2a)
+
+	return buf.Bytes(), nil
+}
+
+func (d *testExtendedData) UnmarshalBinary(data []byte) error {
+	buf := NewBuffer(data)
+
+	v, err := buf.ConsumeUint8()
+	if err != nil {
+		return err
+	}
+
+	d.value = v ^ 0x2a
+
+	return nil
+}
+
+func TestExtendedPacketNoData(t *testing.T) {
+	const (
+		id              = 42
+		extendedRequest = "foo@example"
+	)
+
+	p := &ExtendedPacket{
+		RequestID:       id,
+		ExtendedRequest: extendedRequest,
+	}
+
+	data, err := p.MarshalBinary()
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	want := []byte{
+		0x00, 0x00, 0x00, 20,
+		200,
+		0x00, 0x00, 0x00, 42,
+		0x00, 0x00, 0x00, 11, 'f', 'o', 'o', '@', 'e', 'x', 'a', 'm', 'p', 'l', 'e',
+	}
+
+	if !bytes.Equal(data, want) {
+		t.Fatalf("Marshal() = %X, but wanted %X", data, want)
+	}
+
+	*p = ExtendedPacket{}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+
+	if p.ExtendedRequest != extendedRequest {
+		t.Errorf("UnmarshalBinary(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
+	}
+}
+
+func TestExtendedPacketTestData(t *testing.T) {
+	const (
+		id              = 42
+		extendedRequest = "foo@example"
+		textValue       = 13
+	)
+
+	const value = 13
+
+	p := &ExtendedPacket{
+		RequestID:       id,
+		ExtendedRequest: extendedRequest,
+		Data: &testExtendedData{
+			value: textValue,
+		},
+	}
+
+	data, err := p.MarshalBinary()
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	want := []byte{
+		0x00, 0x00, 0x00, 21,
+		200,
+		0x00, 0x00, 0x00, 42,
+		0x00, 0x00, 0x00, 11, 'f', 'o', 'o', '@', 'e', 'x', 'a', 'm', 'p', 'l', 'e',
+		0x27,
+	}
+
+	if !bytes.Equal(data, want) {
+		t.Fatalf("Marshal() = %X, but wanted %X", data, want)
+	}
+
+	*p = ExtendedPacket{
+		Data: new(testExtendedData),
+	}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+
+	if p.ExtendedRequest != extendedRequest {
+		t.Errorf("UnmarshalBinary(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
+	}
+
+	if data, ok := p.Data.(*testExtendedData); !ok {
+		t.Errorf("UnmarshalBinary(): Data was type %T, but expected %T", p.Data, data)
+
+	} else if data.value != value {
+		t.Errorf("UnmarshalBinary(): Data.value was %#x, but expected %#x", data.value, value)
+	}
+
+	*p = ExtendedPacket{}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+
+	if p.ExtendedRequest != extendedRequest {
+		t.Errorf("UnmarshalBinary(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
+	}
+
+	wantBuffer := []byte{0x27}
+
+	if data, ok := p.Data.(*Buffer); !ok {
+		t.Errorf("UnmarshalBinary(): Data was type %T, but expected %T", p.Data, data)
+
+	} else if !bytes.Equal(data.b, wantBuffer) {
+		t.Errorf("UnmarshalBinary(): Data was %X, but expected %X", data.b, wantBuffer)
+	}
+}
+
+func TestExtendedReplyNoData(t *testing.T) {
+	const (
+		id = 42
+	)
+
+	p := &ExtendedReplyPacket{
+		RequestID: id,
+	}
+
+	data, err := p.MarshalBinary()
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	want := []byte{
+		0x00, 0x00, 0x00, 5,
+		201,
+		0x00, 0x00, 0x00, 42,
+	}
+
+	if !bytes.Equal(data, want) {
+		t.Fatalf("Marshal() = %X, but wanted %X", data, want)
+	}
+
+	*p = ExtendedReplyPacket{}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+}
+
+func TestExtendedReplyPacketTestData(t *testing.T) {
+	const (
+		id        = 42
+		textValue = 13
+	)
+
+	const value = 13
+
+	p := &ExtendedReplyPacket{
+		RequestID: id,
+		Data: &testExtendedData{
+			value: textValue,
+		},
+	}
+
+	data, err := p.MarshalBinary()
+	if err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	want := []byte{
+		0x00, 0x00, 0x00, 6,
+		201,
+		0x00, 0x00, 0x00, 42,
+		0x27,
+	}
+
+	if !bytes.Equal(data, want) {
+		t.Fatalf("Marshal() = %X, but wanted %X", data, want)
+	}
+
+	*p = ExtendedReplyPacket{
+		Data: new(testExtendedData),
+	}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+
+	if data, ok := p.Data.(*testExtendedData); !ok {
+		t.Errorf("UnmarshalBinary(): Data was type %T, but expected %T", p.Data, data)
+
+	} else if data.value != value {
+		t.Errorf("UnmarshalBinary(): Data.value was %#x, but expected %#x", data.value, value)
+	}
+
+	*p = ExtendedReplyPacket{}
+
+	// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
+	if err := p.UnmarshalBinary(data[5:]); err != nil {
+		t.Fatal("unexpected error:", err)
+	}
+
+	if p.RequestID != uint32(id) {
+		t.Errorf("UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
+	}
+
+	wantBuffer := []byte{0x27}
+
+	if data, ok := p.Data.(*Buffer); !ok {
+		t.Errorf("UnmarshalBinary(): Data was type %T, but expected %T", p.Data, data)
+
+	} else if !bytes.Equal(data.b, wantBuffer) {
+		t.Errorf("UnmarshalBinary(): Data was %X, but expected %X", data.b, wantBuffer)
+	}
+}