Name: akR10050 Date: 09/12/2003



InetAddress.isReachable(int) returns true for unreachable addresses.

Here is the testcase:
------------------- Test31.java ---------------------

import java.net.InetAddress;
import java.io.IOException;

public class Test31 {
    public static void main(String[] args) {
        /* STEP 1: get an unreachable host. */
        InetAddress ia = null;
        try {
            ia = InetAddress.getByName("2.2.2.1");
        } catch (IOException ioe) {
            System.err.println("WRONG: " + ioe);
        }

        /* STEP 2: declare the timeout value. 5 seconds is more than enough to
         * access a host on LAN. */
        int timeout = 5;

        /* STEP 3: test reachability of the host. */
        try {
            if ( ia.isReachable(timeout) ) {
                System.err.println("WRONG: true returned with timeout value "
                        + timeout + " for host " + ia);
            } else {
                System.err.println("CORRECT: false returned");
            }
        } catch (IOException ioe) {
            System.err.println("WRONG: " + ioe);
        }
    }
}
-----------------------------------------------------

The following is the output running the test:

----------------- sample output ---------------------

$ java -version
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b18)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b18, mixed mode)

$ java Test31
WRONG: true returned with timeout value 5 for host /2.2.2.1

$ ping 2.2.2.1 5
no answer from 2.2.2.1

-----------------------------------------------------

This output was achieved on a solaris box (therefore ping command is one of
solaris). However, isReachable(int) exposes the same behaviour on other
platforms.

======================================================================