diff --git a/mtglib/init.go b/mtglib/init.go
index e663c62..5f68661 100644
--- a/mtglib/init.go
+++ b/mtglib/init.go
@@ -27,6 +27,7 @@ type Network interface {
 	DialContext(ctx context.Context, network, address string) (net.Conn, error)
 	MakeHTTPClient(func(ctx context.Context, network, address string) (net.Conn, error)) *http.Client
 	IdleTimeout() time.Duration
+	TCPBufferSize() int
 }
 
 type AntiReplayCache interface {
diff --git a/network/default.go b/network/default.go
index 72b3da5..db104f0 100644
--- a/network/default.go
+++ b/network/default.go
@@ -60,6 +60,10 @@ func (d *defaultDialer) DialContext(ctx context.Context, network, address string
 	return tcpConn, nil
 }
 
+func (d *defaultDialer) TCPBufferSize() int {
+	return d.bufferSize
+}
+
 func NewDefaultDialer(timeout time.Duration, bufferSize int) (Dialer, error) {
 	switch {
 	case timeout < 0:
diff --git a/network/default_test.go b/network/default_test.go
index a6b24c7..4136770 100644
--- a/network/default_test.go
+++ b/network/default_test.go
@@ -71,6 +71,10 @@ func (suite *DefaultDialerTestSuite) TestHTTPRequest() {
 	suite.Equal(http.StatusOK, resp.StatusCode)
 }
 
+func (suite *DefaultDialerTestSuite) TestTCPBufferSize() {
+	suite.Equal(network.DefaultBufferSize, suite.d.TCPBufferSize())
+}
+
 func TestDefaultDialer(t *testing.T) {
 	t.Parallel()
 	suite.Run(t, &DefaultDialerTestSuite{})
diff --git a/network/init.go b/network/init.go
index 3bab936..bdb4b26 100644
--- a/network/init.go
+++ b/network/init.go
@@ -29,4 +29,5 @@ var (
 type Dialer interface {
 	Dial(network, address string) (net.Conn, error)
 	DialContext(ctx context.Context, network, address string) (net.Conn, error)
+	TCPBufferSize() int
 }
diff --git a/network/init_internal_test.go b/network/init_internal_test.go
index 9335818..b908a01 100644
--- a/network/init_internal_test.go
+++ b/network/init_internal_test.go
@@ -22,3 +22,7 @@ func (d *DialerMock) DialContext(ctx context.Context, network, address string) (
 
 	return args.Get(0).(net.Conn), args.Error(1)
 }
+
+func (d *DialerMock) TCPBufferSize() int {
+	return d.Called().Int(0)
+}
diff --git a/network/init_test.go b/network/init_test.go
index f42d1c3..b75ff11 100644
--- a/network/init_test.go
+++ b/network/init_test.go
@@ -30,6 +30,10 @@ func (d *DialerMock) DialContext(ctx context.Context, network, address string) (
 	return args.Get(0).(net.Conn), args.Error(1)
 }
 
+func (d *DialerMock) TCPBufferSize() int {
+	return d.Called().Int(0)
+}
+
 type HTTPServerTestSuite struct {
 	httpServer *httptest.Server
 }
diff --git a/network/load_balanced_socks5.go b/network/load_balanced_socks5.go
index 2a60d69..41331a5 100644
--- a/network/load_balanced_socks5.go
+++ b/network/load_balanced_socks5.go
@@ -9,13 +9,18 @@ import (
 )
 
 type loadBalancedSocks5Dialer struct {
-	dialers []Dialer
+	dialers    []Dialer
+	bufferSize int
 }
 
 func (l loadBalancedSocks5Dialer) Dial(network, address string) (net.Conn, error) {
 	return l.DialContext(context.Background(), network, address)
 }
 
+func (l loadBalancedSocks5Dialer) TCPBufferSize() int {
+	return l.bufferSize
+}
+
 func (l loadBalancedSocks5Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
 	length := len(l.dialers)
 	start := rand.Intn(length)
@@ -45,6 +50,7 @@ func NewLoadBalancedSocks5Dialer(baseDialer Dialer, proxyURLs []*url.URL) (Diale
 	}
 
 	return loadBalancedSocks5Dialer{
-		dialers: dialers,
+		dialers:    dialers,
+		bufferSize: baseDialer.TCPBufferSize(),
 	}, nil
 }
diff --git a/network/load_balanced_socks5_test.go b/network/load_balanced_socks5_test.go
index b6983c8..25ca3b3 100644
--- a/network/load_balanced_socks5_test.go
+++ b/network/load_balanced_socks5_test.go
@@ -57,6 +57,7 @@ func (suite *LoadBalancedSocks5TestSuite) TestCannotDial() {
 	baseDialer.On("DialContext", mock.Anything, "tcp", "127.0.0.2:1080").
 		Times(network.ProxyDialerOpenThreshold).
 		Return(&net.TCPConn{}, io.EOF)
+	baseDialer.On("TCPBufferSize").Return(network.DefaultBufferSize)
 
 	lbDialer, err := network.NewLoadBalancedSocks5Dialer(baseDialer, []*url.URL{
 		{Scheme: "socks5", User: url.UserPassword("user", "password"), Host: "127.0.0.1:1080"},
diff --git a/network/network.go b/network/network.go
index 585ff3c..f2cb044 100644
--- a/network/network.go
+++ b/network/network.go
@@ -75,6 +75,10 @@ func (n *network) IdleTimeout() time.Duration {
 	return n.idleTimeout
 }
 
+func (n *network) TCPBufferSize() int {
+	return n.dialer.TCPBufferSize()
+}
+
 func (n *network) dnsResolve(protocol, address string) ([]string, error) {
 	if net.ParseIP(address) != nil {
 		return []string{address}, nil
diff --git a/network/socks5.go b/network/socks5.go
index 91c9c61..66c1f23 100644
--- a/network/socks5.go
+++ b/network/socks5.go
@@ -2,16 +2,34 @@ package network
 
 import (
 	"fmt"
+	"net"
 	"net/url"
 
 	"golang.org/x/net/proxy"
 )
 
+type socks5Dialer struct {
+	proxy.ContextDialer
+
+	bufferSize int
+}
+
+func (s socks5Dialer) Dial(protocol, address string) (net.Conn, error) {
+	return s.ContextDialer.(proxy.Dialer).Dial(protocol, address)
+}
+
+func (s socks5Dialer) TCPBufferSize() int {
+	return s.bufferSize
+}
+
 func NewSocks5Dialer(baseDialer Dialer, proxyURL *url.URL) (Dialer, error) {
 	rv, err := proxy.FromURL(proxyURL, baseDialer)
 	if err != nil {
 		return nil, fmt.Errorf("cannot initialize socks5 proxy dialer: %w", err)
 	}
 
-	return rv.(Dialer), nil
+	return socks5Dialer{
+		ContextDialer: rv.(proxy.ContextDialer),
+		bufferSize:    baseDialer.TCPBufferSize(),
+	}, nil
 }
diff --git a/testlib/mtglib_network_mock.go b/testlib/mtglib_network_mock.go
index 23fa8ba..3e89fdd 100644
--- a/testlib/mtglib_network_mock.go
+++ b/testlib/mtglib_network_mock.go
@@ -33,3 +33,7 @@ func (m *MtglibNetworkMock) MakeHTTPClient(dialFunc func(ctx context.Context,
 func (m *MtglibNetworkMock) IdleTimeout() time.Duration {
 	return m.Called().Get(0).(time.Duration)
 }
+
+func (m *MtglibNetworkMock) TCPBufferSize() int {
+	return m.Called().Int(0)
+}