Name: dk106046 Date: 08/26/2004

OPERATING SYSTEM(S):
Windows XP

FULL JDK VERSION(S):
java version "1.5.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta3-b56)
Java HotSpot(TM) Client VM (build 1.5.0-beta3-b56, mixed mode)


According to the Networking IPv6 User Guide, IPv4 addresses should be preferred
over IPv6 addresses, unless java.net.preferIPv6Addresses is set to 'true'. This
does not happen in the following scenario:

Add these lines to c:\windows\system32\drivers\etc\hosts:

fe80:0:0:0:20d:60ff:fe49:47d TestHost
9.20.187.96 TestHost
9.20.187.06 TestHost
fe80:0:0:0:20d:60ff:fe49:47 TestHost

Compile and run the following test:

public class test {
    public static void main (String [] args) {
        try {
            System.out.println("Using getByName(): "
                + java.net.InetAddress.getByName(args.length < 1 ? "localhost" : args[0]).getHostAddress());
            java.net.InetAddress[] ias = java.net.InetAddress.getAllByName(args.length < 1 ? "localhost" : args[0]);
            System.out.println("Using getAllByName():");
            for (int i=0; i<ias.length; i++) {
                String getbyName = ias[i].getHostAddress();
                System.out.println(" " + getbyName);
            }
        } catch (Exception ex) {
            System.out.println("Exc: " + ex.getMessage());
            ex.printStackTrace();
        }
    }
}

C:\dev\scratch>java test TestHost
Using getByName(): fe80:0:0:0:20d:60ff:fe49:47
Using getAllByName():
    fe80:0:0:0:20d:60ff:fe49:47
    9.20.187.6
    9.20.187.96
    fe80:0:0:0:20d:60ff:fe49:47d

C:\dev\scratch>java -Djava.net.preferIPv6Addresses
=true test TestHost
Using getByName(): fe80:0:0:0:20d:60ff:fe49:47d
Using getAllByName():
    fe80:0:0:0:20d:60ff:fe49:47d
    9.20.187.96
    9.20.187.6
    fe80:0:0:0:20d:60ff:fe49:47

C:\dev\scratch>java -Djava.net.preferIPv4Stack=true test TestHost
Using getByName(): 9.20.187.96
Using getAllByName():
    9.20.187.96
    9.20.187.6

The first invocation should have resulted in the IPv4 address returned by the last
invocation, where IPv6 is disabled. The last invocation produces the same result
with 1.4.2. ("Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)").

[This bug is being submitted as a courtesy, in order to maintain uniformity between Sun & IBM JDKs. It has been fixed in IBM JDKs.
Please contact ###@###.### if you have questions.]
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