func TestLookupGoogleSRV(t *testing.T) {
	t.Parallel()
	mustHaveExternalNetwork(t)

	if runtime.GOOS == "ios" {
		t.Skip("no resolv.conf on iOS")
	}

	if !supportsIPv4() || !*testIPv4 {
		t.Skip("IPv4 is required")
	}

	attempts := 0
	for i := 0; i < len(lookupGoogleSRVTests); i++ {
		tt := lookupGoogleSRVTests[i]
		cname, srvs, err := LookupSRV(tt.service, tt.proto, tt.name)

		if err != nil {
			t.Helper()
			t.Fatal(err)
		}
		return ln
	}

	switch network {
	case "tcp":
		if supportsIPv4() {
			return listen("tcp4", "127.0.0.1:0")
		}
		if supportsIPv6() {
			return listen("tcp6", "[::1]:0")
		}
	case "tcp4":
		if supportsIPv4() {
			return listen("tcp4", "127.0.0.1:0")
		}
	case "tcp6":
		if supportsIPv6() {
			return listen("tcp6", "[::1]:0")
		}

		proxyType:          proxy.Type,
		proxyVersion:       proxy.Metadata.IstioVersion,
		sidecarScope:       proxy.SidecarScope,
		passThroughBindIPs: getPassthroughBindIPs(proxy.GetIPMode()),
		supportsIPv4:       proxy.SupportsIPv4(),
		supportsIPv6:       proxy.SupportsIPv6(),
		sendHbone:          features.EnableHBONESend || proxy.IsWaypointProxy(),
		locality:           proxy.Locality,
		proxyLabels:        proxy.Labels,

	case "windows":
		t.Skipf("not implemented a way to cancel dial racers in TCP SYN-SENT state on %s", runtime.GOOS)
	case "openbsd":
		testenv.SkipFlaky(t, 15157)
	}
	if !supportsIPv4() || !supportsIPv6() {
		t.Skip("both IPv4 and IPv6 are required")
	}

	before := sw.Sockets()
	origTestHookLookupIP := testHookLookupIP
	defer func() { testHookLookupIP = origTestHookLookupIP }()

// to be greater than or equal to 4.4.
func TestDualStackTCPListener(t *testing.T) {
	switch runtime.GOOS {
	case "plan9":
		t.Skipf("not supported on %s", runtime.GOOS)
	}
	if !supportsIPv4() || !supportsIPv6() {
		t.Skip("both IPv4 and IPv6 are required")
	}

	for _, tt := range dualStackTCPListenerTests {
		if !testableListenArgs(tt.network1, JoinHostPort(tt.address1, "0"), "") {

func (node *Proxy) DiscoverIPMode() {
	node.ipMode = pm.DiscoverIPMode(node.IPAddresses)
	node.GlobalUnicastIP = networkutil.GlobalUnicastIP(node.IPAddresses)
}

// SupportsIPv4 returns true if proxy supports IPv4 addresses.
func (node *Proxy) SupportsIPv4() bool {
	return node.ipMode == IPv4 || node.ipMode == Dual
}

// SupportsIPv6 returns true if proxy supports IPv6 addresses.
func (node *Proxy) SupportsIPv6() bool {

		t.Logf("%s: error as expected: %v", network, err)
	}
}

func TestDialAddrError(t *testing.T) {
	switch runtime.GOOS {
	case "plan9":
		t.Skipf("not supported on %s", runtime.GOOS)
	}

	if !supportsIPv4() || !supportsIPv6() {
		t.Skip("both IPv4 and IPv6 are required")
	}

	for _, tt := range []struct {
		network string
		lit     string
		addr    *TCPAddr
	}{
		{"tcp4", "::1", nil},

			if len(addresses) > 0 {
				return addresses[0]
			}
		}

		if node.Metadata.DNSCapture && node.Metadata.DNSAutoAllocate && s.DefaultAddress == constants.UnspecifiedIP {
			if node.SupportsIPv4() && s.AutoAllocatedIPv4Address != "" {
				return s.AutoAllocatedIPv4Address
			}
			if node.SupportsIPv6() && s.AutoAllocatedIPv6Address != "" {
				return s.AutoAllocatedIPv6Address
			}
		}
	}