defer ln.Close()
	_, port, err := SplitHostPort(ln.Addr().String())
	if err != nil {
		t.Fatal(err)
	}

	ctx := contextWithNonZeroDeadline{Context: context.Background()}
	var dialer Dialer
	c, err := dialer.DialContext(ctx, "tcp", JoinHostPort("", port))
	if err != nil {
		t.Fatal(err)
	}
	c.Close()

		if err != nil {
			t.Fatalf("unexpected error from Dial with %v connections: %v", len(dialed), err)
		}
		dialed = append(dialed, c)
		if testing.Verbose() && len(dialed)%(1<<12) == 0 {
			t.Logf("dialed %d connections", len(dialed))
		}
	}
	t.Logf("dialed %d connections", len(dialed))

	// Now that all of the ports are in use, dialing another should fail due
	// to port exhaustion, which (for POSIX-like socket APIs) should return

			cancel()
		}()
		go func(i int) {
			defer wg.Done()
			var dialer Dialer
			// Try to connect to a real host on a port
			// that it is not listening on.
			_, err := dialer.DialContext(ctx, "tcp", "golang.org:3")
			if err == nil {
				t.Errorf("Dial to unbound port succeeded on attempt %d", i)
			}
			<-sem
		}(i)
	}
	wg.Wait()

		},
	}

	for _, tc := range testcases {
		t.Run(tc.name, func(t *testing.T) {
			// Setup the various pieces such as the fake dialer prior to initializing the egress selector.
			// Go doesn't allow function pointer comparison, nor does its reflect package
			// So overriding the default dialer to detect if it is returned.
			fake := &fakeEgressSelection{}
			directDialer = fake.fakeDirectDialer
			cs, err := NewEgressSelector(tc.input)

		}()
	}
	attempts := 10 * N
	fails := 0
	d := &Dialer{Timeout: 200 * time.Millisecond}
	for i := 0; i < attempts; i++ {
		c, err := d.Dial("tcp", ln.Addr().String())
		if err != nil {
			fails++
		} else {
			c.Close()
		}
	}
	ln.Close()
	wg.Wait()
	if fails > attempts/9 { // see issues 7400 and 7541
		t.Fatalf("too many Dial failed: %v", fails)
	}
	if fails > 0 {

}

// wantDial waits for the Transport to start a Dial.
func (dt *transportDialTester) wantDial() *transportDialTesterConn {
	c := <-dt.dials
	c.connID = dt.dialCount
	dt.dialCount++
	dt.t.Logf("Dial %v: started", c.connID)
	return c
}

// finish completes a Dial.
func (c *transportDialTesterConn) finish(err error) {
	c.t.Logf("Dial %v: finished (err:%v)", c.connID, err)
	c.ready <- err

	ctrlCtxFn := sd.Dialer.ControlContext
	if ctrlCtxFn == nil && sd.Dialer.Control != nil {
		ctrlCtxFn = func(ctx context.Context, network, address string, c syscall.RawConn) error {
			return sd.Dialer.Control(network, address, c)
		}
	}
	fd, err := internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_STREAM, proto, "dial", ctrlCtxFn)

	defer ls.teardown()
	if err := ls.buildup(handler); err != nil {
		t.Fatal(err)
	}

	for _, cfg := range testConfigs {
		d := Dialer{
			KeepAlive:       defaultTCPKeepAliveIdle, // should be ignored
			KeepAliveConfig: cfg}
		c, err := d.Dial("tcp", ls.Listener.Addr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer c.Close()

		if errHook != nil {
			t.Fatal(errHook)
		}

		a.IP = net.ParseIP(host)
		if a.IP == nil {
			a.Name = host
		}
		if i == 0 {
			proxy = a
		} else {
			dst = a
		}
	}
	return
}

// NewDialer returns a new Dialer that dials through the provided
// proxy server's network and address.
func socksNewDialer(network, address string) *socksDialer {
	return &socksDialer{proxyNetwork: network, proxyAddress: address, cmd: socksCmdConnect}
}

// DialContext is a function to make custom Dial for internode communications
type DialContext func(ctx context.Context, network, address string) (net.Conn, error)

// NewInternodeDialContext configures a custom dialer for internode communications
func NewInternodeDialContext(dialTimeout time.Duration, _ TCPOptions) DialContext {
	return func(ctx context.Context, network, addr string) (net.Conn, error) {
		dialer := &net.Dialer{
			Timeout: dialTimeout,