Use native dialer to communicate with fronting domain

internal/testlib/mtglib_network_mock.go

@@ -2,6 +2,7 @@ package testlib
 
 import (
 	"context"
+	"net"
 	"net/http"
 
 	"github.com/9seconds/mtg/v2/essentials"
@@ -24,6 +25,10 @@ func (m *MtglibNetworkMock) DialContext(ctx context.Context, network, address st
 	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
+func (m *MtglibNetworkMock) NativeDialer() *net.Dialer {
+	return m.Called().Get(0).(*net.Dialer)
+}
+
 func (m *MtglibNetworkMock) MakeHTTPClient(dialFunc func(ctx context.Context,
 	network, address string) (essentials.Conn, error),
 ) *http.Client {