[jboss-jira] [JBoss JIRA] Updated: (JGRP-638) Look at IP multicasting and IPv6

[Bela Ban (JIRA)]

     [ http://jira.jboss.com/jira/browse/JGRP-638?page=all ]

Bela Ban updated JGRP-638:
--------------------------

    Attachment: SimpleMulticast.java

> Look at IP multicasting and IPv6
> --------------------------------
>
>                 Key: JGRP-638
>                 URL: http://jira.jboss.com/jira/browse/JGRP-638
>             Project: JGroups
>          Issue Type: Task
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>            Priority: Minor
>             Fix For: 2.7
>
>         Attachments: SimpleMulticast.java
>
>
> [Carlo DeWolf's email]
> Bug 1:
> Aha, in IPv6 mode the incorrect interface is chosen to send out packets.
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4742177
> So to actually get the right sender into the packet you must bind to the
> address.
> MultiSocket senderSocket = new MultiSocket(new
> InetSocketAddress(sendFrom, 0));
> Loopback must always be false. I'm not sure why, but if falls apart if
> you set it to true. (Might be because of the above.)
> senderSocket.setLoopback(false);
> The receiving socket must be bound to INADDR_ANY (because of Windows):
> receiverSocket = new MultiSocket(port);
> Bug 2:
> The receiver socket must join with an interface, because else the
> packets sent from the sendSocket are immediately blocked by the
> interface (not a member of the group).
> receiverSocket.joinGroup(mcastaddr, netIf); // Note that port in
> mcastaddr is ignored.
> I think it's also possible to have the sendSocket join, but I'm done.
> The effect here was that as long as nobody joins on the default
> multicast interface, nobody receives packets. This would seldomly occur,
> because there is always someone who joins the default interface.
> I've attached by own multicast tester. Which works in every config
> except on Windows with the counterfeit, doubtful, dubious, equivocal,
> fake, false, fictitious, inaccurate, mythical, spurious,
> unauthenticated, ungenuine, unsubstantiated, untrue, unverified, wrong
> "MS TCP loopback" device.

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