ipv4 := net.IPv4(10, 255, 0, 0)

	fmt.Println(ipv6.String())
	fmt.Println(ipv4.String())

	// Output:
	// fc00::
	// 10.255.0.0
}

func ExampleIP_To16() {
	ipv6 := net.IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
	ipv4 := net.IPv4(10, 255, 0, 0)

	fmt.Println(ipv6.To16())
	fmt.Println(ipv4.To16())

	// Output:
	// fc00::

	{
		name: "kernel.shm_rmid_forced",
	}, {
		name: "net.ipv4.ip_local_port_range",
	}, {
		name: "net.ipv4.tcp_syncookies",
	}, {
		name: "net.ipv4.ping_group_range",
	}, {
		name: "net.ipv4.ip_unprivileged_port_start",
	}, {
		name:   "net.ipv4.ip_local_reserved_ports",
		kernel: utilkernel.IPLocalReservedPortsNamespacedKernelVersion,
	}, {
		name:   "net.ipv4.tcp_keepalive_time",

		},
		{
			name:         "contains IP ipv4 (IP)",
			expr:         `cidr("192.168.0.0/24").containsIP(ip("192.168.0.1"))`,
			expectResult: trueVal,
		},
		{
			name:         "does not contain IP ipv4 (IP)",
			expr:         `cidr("192.168.0.0/24").containsIP(ip("192.168.1.1"))`,
			expectResult: falseVal,
		},
		{
			name:         "contains IP ipv4 (string)",

// IPLocalReservedPortsNamespacedKernelVersion is the kernel version in which net.ipv4.ip_local_reserved_ports was namespaced(netns).
// (ref: https://github.com/torvalds/linux/commit/122ff243f5f104194750ecbc76d5946dd1eec934)
const IPLocalReservedPortsNamespacedKernelVersion = "3.16"

// IPVSConnReuseModeMinSupportedKernelVersion is the minium kernel version supporting net.ipv4.vs.conn_reuse_mode.

}

func checkUnicastStats(ifStats *ifStats, uniStats *routeStats) error {
	// Test the existence of connected unicast routes for IPv4.
	if supportsIPv4() && ifStats.loop+ifStats.other > 0 && uniStats.ipv4 == 0 {
		return fmt.Errorf("num IPv4 unicast routes = 0; want >0; summary: %+v, %+v", ifStats, uniStats)
	}
	// Test the existence of connected unicast routes for IPv6.
	// We can assume the existence of ::1/128 when at least one

		// Dual stack IPv4/IPv6
		{"192.0.2.1/24,2001:db2:1:3:4::1/112", "192.0.2.1", "192.0.2.0/24", "2001:db2:1:3:4::/112", false},
		// Dual stack IPv6/IPv4
		{"2001:db2:1:3:4::1/112,192.0.2.1/24", "2001:db2:1:3:4::1", "2001:db2:1:3:4::/112", "192.0.2.0/24", false},

		{"192.0.2.1/30,192.168.128.0/17", "<nil>", "<nil>", "<nil>", true},
		// Invalid ip range[0] IPv4 mask

// varyingly accepted by some programs due to an under-specification
// of the shapes of IPv4 addresses:
//
//   - IPv4 as a single 32-bit uint: 4660 (same as "1.2.3.4")
//   - IPv4 with octal numbers: 0300.0250.0.01 (same as "192.168.0.1")
//   - IPv4 with hex numbers: 0xc0.0xa8.0x0.0x1 (same as "192.168.0.1")
//   - IPv4 in "class-B style": 1.2.52 (same as "1.2.3.4")
//   - IPv4 in "class-A style": 1.564 (same as "1.2.3.4")

	CustomSetup Instance = "customsetup"

	// IPv4 indicates a test is only compatible with IPv4 clusters.
	// Any usage of this should have an associated GitHub issue to make it compatible with IPv6
	IPv4 Instance = "ipv4"
)

var all = NewSet(
	Postsubmit,
	CustomSetup,
	IPv4)

// Find the label with the given name
func Find(name string) (Instance, bool) {

	// If external IPv4 connectivity exists, we can try dialing
	// non-node/interface local scope IPv4 addresses.
	// On Windows, Lookup APIs may not return IPv4-related
	// resource records when a node has no external IPv4
	// connectivity.
	testIPv4 = flag.Bool("ipv4", true, "assume external IPv4 connectivity exists")

	// If external IPv6 connectivity exists, we can try dialing

=== NAME  TestAddrStringAllocs
=== RUN   TestAddrStringAllocs/ipv4
=== NAME  TestAddrStringAllocs
=== RUN   TestAddrStringAllocs/ipv6
=== NAME  TestAddrStringAllocs
=== RUN   TestAddrStringAllocs/ipv6+zone
=== NAME  TestAddrStringAllocs
=== RUN   TestAddrStringAllocs/ipv4-in-ipv6
=== NAME  TestAddrStringAllocs
=== RUN   TestAddrStringAllocs/ipv4-in-ipv6+zone
=== NAME  TestAddrStringAllocs