RE: [ssm] IGMPv3/SSM API for Java ?

"James Lingard" <> Sat, 30 April 2005 11:34 UTC

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Subject: RE: [ssm] IGMPv3/SSM API for Java ?
Date: Sat, 30 Apr 2005 12:34:19 +0100
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Thread-Topic: [ssm] IGMPv3/SSM API for Java ?
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From: "James Lingard" <>
To: "Toerless Eckert" <>, <>
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I'm pretty sure you're right that there's no SSM API, though I can't confirm that there's no implicit way of triggering (S,G) membership reports.  The following RFE has been raised in Sun's Java bug database for this issue (though you may need to register in order to view this page):

The standard way of encouraging Sun to get bugs fixed is for lots of people to vote for them.  See:

I think they do actually pay attention to these.  Currently this RFE has only 2 votes (of which one is mine), but if we could encourage lots (i.e. >100) of IETF multicast folks to vote for this bug, something might happen :)

Other than that, there is something called the Java Community Process (see by which new APIs and language features are often developed, although I'm no expert on how this works.

It also seems that for the next release (J2SE 6.0), Sun are soliciting externally contributed code (see  So if there's someone out there with the time to work on this, this route may well be the fastest.

Hope that helps,

James Lingard
Data Connection Ltd (DCL)

-----Original Message-----
From: []On Behalf Of
Toerless Eckert
Sent: 30 April 2005 02:49
Subject: [ssm] IGMPv3/SSM API for Java ?

Looking at

it looks as if Java does NOT have any SSM API, eg: nothing like
JoinSourceGroup(). Can anyone more aware of Java confirm this ? Or
would any Java implementation implicitly trigger at least an IGMPv3
INCLUDE({S},G) membership report whenever a connected datagram socket
was bound to a group (get the source address from connect(), get the
group from JoinGroup() ?) ... I wouldn't think so.. ?

So, assuming the Java world has ignored SSM so far, what can be done
to change this ? I wouldn't even know who defines the API (within ?
outside of Sun ??)


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