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

// following:
//	golang.org/x/net/ipv4
//	golang.org/x/net/ipv6
//	golang.org/x/net/icmp

type resolveIPAddrTest struct {
	network       string
	litAddrOrName string
	addr          *IPAddr
	err           error
}

var resolveIPAddrTests = []resolveIPAddrTest{
	{"ip", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
	{"ip4", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},

	litAddrOrName string
	addr          *IPAddr
	err           error
}

var resolveIPAddrTests = []resolveIPAddrTest{
	{"ip", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
	{"ip4", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
	{"ip4:icmp", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
}

func setupTestData() {
	resolveIPAddrTests = append(resolveIPAddrTests,

			Value: "1",
		},
		{
			Name:  "net.ipv4.conf.eno2/100.rp_filter",
			Value: "1",
		},
		{
			Name:  "net/ipv4/ip_local_port_range",
			Value: "1024 65535",
		},
	}
	exceptSysctls := []v1.Sysctl{
		{
			Name:  "kernel.msgmax",
			Value: "8192",
		},
		{
			Name:  "kernel.shm_rmid_forced",
			Value: "1",
		},
		{
			Name:  "net.ipv4.conf.eno2/100.rp_filter",
			Value: "1",
		},
		{

  // and host bits. For example an IPv4 address of 192.168.0.0/24, splits the
  // address into 24 bits for the network portion and 8 bits for the host portion.
  // To allocate 256 IPs, set this field to 8 (a /24 mask for IPv4 or a /120 for IPv6).
  // Minimum value is 4 (16 IPs).
  // This field is immutable.
  // +required
  optional int32 perNodeHostBits = 2;

  // ipv4 defines an IPv4 IP block in CIDR notation(e.g. "10.0.0.0/8").

  --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

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.

			errStr:   "",
			lookup:   nil,
		},
		{
			name:     "Host by IPv4",
			input:    "127.0.0.1:9080",
			expected: "127.0.0.1:9080",
			errStr:   "",
			lookup:   nil,
		},
		{
			name:     "Host by IPv6",
			input:    "[::1]:9080",
			expected: "[::1]:9080",
			errStr:   "",
			lookup:   nil,
		},
		{
			name:     "Bad IPv4",
			input:    "127.0.0.1.1:9080",
			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)
  }