}

    return true;
  }

  /**
   * Returns the IPv4 address embedded in an IPv4 compatible address.
   *
   * @param ip {@link Inet6Address} to be examined for an embedded IPv4 address
   * @return {@link Inet4Address} of the embedded IPv4 address
   * @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address
   */

    }

    return true;
  }

  /**
   * Returns the IPv4 address embedded in an IPv4 compatible address.
   *
   * @param ip {@link Inet6Address} to be examined for an embedded IPv4 address
   * @return {@link Inet4Address} of the embedded IPv4 address
   * @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address
   */

		},
		{
			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.

			n -= 8
			continue
		}
		m[i] = ^byte(0xff >> n)
		n = 0
	}
	return m
}

// Well-known IPv4 addresses
var (
	IPv4bcast     = IPv4(255, 255, 255, 255) // limited broadcast
	IPv4allsys    = IPv4(224, 0, 0, 1)       // all systems
	IPv4allrouter = IPv4(224, 0, 0, 2)       // all routers
	IPv4zero      = IPv4(0, 0, 0, 0)         // all zeros
)

// Well-known IPv6 addresses
var (

}

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

import org.junitpioneer.jupiter.RetryingTest
import org.opentest4j.TestAbortedException

/**
 * This test binds two different web servers (IPv4 and IPv6) to the same port, but on different
 * local IP addresses. Requests made to `127.0.0.1` will reach the IPv4 server, and requests made to
 * `::1` will reach the IPv6 server.
 *
 * By orchestrating two different servers with the same port but different IP addresses, we can

// The IP address must be an IPv4 or IPv6 address.
// IPv4-mapped IPv6 addresses (e.g. ::ffff:1.2.3.4) are not allowed.
// IP addresses with zones (e.g. fe80::1%eth0) are not allowed.
// Leading zeros in IPv4 address octets are not allowed.
//
//	ip(<string>) <IPAddr>
//
// Examples:
//
//	ip('127.0.0.1') // returns an IPv4 address
//	ip('::1') // returns an IPv6 address

// 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")

	// 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