MulticastSocket's send() is giving exception on LinuxRH6.2 dual stack 
machine when tried to join Multicast IPv6 address and send with some multicast addresses. For example its giving the following exception with ff15::1234:1234:1234:1234 multicast address. It worked fine with 
ff02::1234:1234:1234:1234 and ff01::1234:1234:1234:1234 addresses

ERROR: mcastWriter.mcastWriter(): exception occurred:
java.io.IOException: Cannot assign requested address
java.io.IOException: Cannot assign requested address
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:503)
        at mcastWriter.<init>(mcastWriter.java:138)
        at mcastWriter.main(mcastWriter.java:92)

How to reproduce it:
---------------------

1. Take the attached mcastWriter.java

2. java mcastWriter -d -v -l 0 -m 10

3. Find the exception message.


Other Information:

1. Same code worked fine on Sol sparc 8 / Sol IA 8 dual stack machines.
2. On same machine I am able to join to a V4 multicast address and send without any problem.






java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-b24)
Java HotSpot(TM) Client VM (build 1.3.1-b24, mixed mode)


MulticastSocket throws an error when invoking send() under Linux, it
works under Windows 2000 with this JVM:
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

The sourcecode to reproduce this bug is available in Tomcat/4.0-b6-dev
(http://jakarta. customer .org/cvsweb/index.cgi/jakarta-tomcat-
4.0/catalina/src/share/org/ customer /catalina/cluster/)

relevant files are:
org. customer .catalina.cluster.StandardCluster
org. customer .catalina.cluster.MulticastSender

An excerpt of the trace is as follows:

java.io.IOException: Invalid argument
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:321)
        at org. customer .catalina.cluster.MulticastSender.send
(MulticastSender.java:205)
        at org. customer .catalina.cluster.MulticastSender.send
(MulticastSender.java:192)
        at org. customer .catalina.session.DistributedManager.createSession
(DistributedManager.java:165)
(Review ID: 127038)
======================================================================

N/A

This exception is coming on Redhat Linux dual stack machine with kernel 2.4.3.

  xxxxx@xxxxx    05/02/2001.

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

Seems to be a Linux kernel issue. The problem does not occur if you
add a Global Unicast address to the network interface: eg.
    /sbin/ifconfig eth0 add 2001:0:2:3:0:1:349:b154/64
I have attached a native C program which reproduces the issue
(senderV6.c). This occurs both with 2.2 and 2.4 kernel.

  xxxxx@xxxxx   2001-05-18
------------------------------------------------------------------


Current shipping kernel releases don't support the draft
RFC dealing with IPv6 source address selection
(draft-ietf-ipngwg-default-addr-select-05).
Partial support has been added in the latest snapshot of the
USAGI branch (usagi-20010917). We have tested with this
kernel and it allows us to send multicasts with a scope greater
than the scope of any local address.

  xxxxx@xxxxx   2001-09-21