--pod-subnet       - the pod subnet to specify. Default is 10.244.0.0/16 for IPv4 and fd00:10:244::/56 for IPv6
  --service-subnet   - the service subnet to specify. Default is 10.96.0.0/16 for IPv4 and fd00:10:96::/112 for IPv6
  -i|--ip-family     - ip family to be supported, default is ipv4 only. Value should be ipv4, ipv6, or dual
  --ipv6gw          - set ipv6 as the gateway, necessary for dual-stack IPv6-preferred clusters

// The CIDR must be an IPv4 or IPv6 subnet address with a mask.
// Leading zeros in IPv4 address octets are not allowed.
// IPv4-mapped IPv6 addresses (e.g. ::ffff:1.2.3.4/24) are not allowed.
//
//	cidr(<string>) <CIDR>
//
// Examples:
//
//	cidr('192.168.0.0/16') // returns an IPv4 address with a CIDR mask
//	cidr('::1/128') // returns an IPv6 address with a CIDR mask

		// Single number. Some parsers accept this as an IPv4 address in
		// big-endian uint32 form, but we don't.
		"1234",
		// IPv4 with a zone specifier
		"1.2.3.4%eth0",
		// IPv4 field must have at least one digit
		".1.2.3",
		"1.2.3.",
		"1..2.3",
		// IPv4 address too long
		"1.2.3.4.5",
		// IPv4 in dotted octal form
		"0300.0250.0214.0377",
		// IPv4 in dotted hex form
		"0xc0.0xa8.0x8c.0xff",

	}{
		// 192.168.0.0
		// 11000000.10101000.00000000.00000001
		{
			name: "ipv4 first is a one",
			ip:   netip.MustParseAddr("192.168.0.0"),
			pos:  1,
			want: 1,
		},
		{
			name: "ipv4 middle is a zero",
			ip:   netip.MustParseAddr("192.168.0.0"),
			pos:  16,
			want: 0,
		},
		{
			name: "ipv4 middle is a one",
			ip:   netip.MustParseAddr("192.168.0.0"),
			pos:  13,
			want: 1,

releaseNotes:
  - |
    **Added** gated flag `ISTIO_ENABLE_IPV4_OUTBOUND_LISTENER_FOR_IPV6_CLUSTERS` to manage an additional outbound listener for IPv6-only clusters to deal with IPv4 NAT outbound traffic.

			expected:      "192.168.10.0/24",
			expectedError: false,
			name:          "valid: valid <IPv4,IPv6> ranges from dual-stack",
		},
		{
			svcSubnetList: "fd03::/112,192.168.10.0/24",
			expected:      "fd03::/112",
			expectedError: false,
			name:          "valid: valid <IPv6,IPv4> ranges from dual-stack",
		},
		{
			svcSubnetList: "192.168.10.0/24,fd03:x::/112",
			expected:      "",

fun reorderForHappyEyeballs(addresses: List<InetAddress>): List<InetAddress> {
  if (addresses.size < 2) {
    return addresses
  }

  val (ipv6, ipv4) = addresses.partition { it is Inet6Address }

  return if (ipv6.isEmpty() || ipv4.isEmpty()) {
    addresses
  } else {
    interleave(ipv6, ipv4)
  }

    InetAddress ipv4 = InetAddresses.forString("1.2.3.4");
    assertEquals(ipv4, InetAddresses.getEmbeddedIPv4ClientAddress(testIp));

    // Test 6to4 address.
    testIp = (Inet6Address) InetAddresses.forString("2002:0102:0304::1");
    assertTrue(InetAddresses.hasEmbeddedIPv4ClientAddress(testIp));
    ipv4 = InetAddresses.forString("1.2.3.4");
    assertEquals(ipv4, InetAddresses.getEmbeddedIPv4ClientAddress(testIp));

	network       string
	litAddrOrName string
	addr          *UDPAddr
	err           error
}

var resolveUDPAddrTests = []resolveUDPAddrTest{
	{"udp", "127.0.0.1:0", &UDPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil},
	{"udp4", "127.0.0.1:65535", &UDPAddr{IP: IPv4(127, 0, 0, 1), Port: 65535}, nil},

	{"udp", "[::1]:0", &UDPAddr{IP: ParseIP("::1"), Port: 0}, nil},
	{"udp6", "[::1]:65535", &UDPAddr{IP: ParseIP("::1"), Port: 65535}, nil},

	"runtime"
	"sync"
	_ "unsafe" // for linkname
)

// BUG(rsc,mikio): On DragonFly BSD and OpenBSD, listening on the
// "tcp" and "udp" networks does not listen for both IPv4 and IPv6
// connections. This is due to the fact that IPv4 traffic will not be
// routed to an IPv6 socket - two separate sockets are required if
// both address families are to be supported.
// See inet6(4) for details.