Name: krC82822 Date: 01/10/2001


java version "1.2.1"
Solaris VM (build Solaris_JDK_1.2.1_03, native threads, sunwjit)

java.net.MulticastSocket supports IP multicast when the multicast group is
identified by a single class-D IP address.

There is a newer multicast service model called Source-Specific Multicast
or SSM, which requires that a multicast group is
identified by two IP addresses, a source address, and a group address. The
source address is a regular host IP address and the group address is
probably from the 232/8 range.

java.net.MulticastSocket is an interface to the underlying IGMP API which allows
a host to join or leave specific multicast addresses. The new version of IGMP,
IGMPv3 has been changed as described in section 2. of [3] (see below).

For example, from java.net.MulticastSocket,

public void joinGroup(InetAddress mcastaddr)
               throws IOException

could be changed to

public void joinGroup(InetAddress mcastGroupAddr, java.util.Vector sourceAddrs )
               throws IOException

This would allow the user to specify a list of sources from which to accept
multicast packets on the mcastGroupAddr address.

Following are some references which provide more detailed information and show
that SSM and IGMPv3 are being widely adopted in the industry.

I am available to answer questions as needed.

IETF Documents:
[1] http://www.ietf.org/internet-drafts/draft-holbrook-ssm-arch-01.txt
[2] http://www.ietf.org/internet-drafts/draft-holbrook-idmr-igmpv3-ssm-00.txt
[3] http://www.ietf.org/internet-drafts/draft-ietf-idmr-igmp-v3-05.txt

Leaders in research/industry working with SSM:
[email addresses moved to Comments section, based on Sun privacy policy]

General SSM/IGMPv3 Information:
http://www.winsock2.com/multicast/whitepapers/IETF48_06.htm
http://www.ieng.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t3/dtssm.htm

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

10 Jan 2001, kevin.ryan@eng -- Each time I hit "New [Bug]", I was getting the following error
in the shell window:

java.lang.NoSuchMethodError
        at Incident.BugtraqUpdateOptions$CompanyPanel.<init>(BugtraqUpdateOptions.java:644)
        at Incident.BugtraqUpdateOptions.<init>(BugtraqUpdateOptions.java:174)
        at Incident.IncidentDetailDisplay$DispositionActionListener.actionPerformed(IncidentDetailDisplay.java:3583)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)
        at java.awt.Component.processMouseEvent(Component.java:3715)
        at java.awt.Component.processEvent(Component.java:3544)
        at java.awt.Container.processEvent(Container.java:1165)
        at java.awt.Component.dispatchEventImpl(Component.java:2593)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2452)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2217)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2126)
        at java.awt.Container.dispatchEventImpl(Container.java:1201)
        at java.awt.Window.dispatchEventImpl(Window.java:912)
        at java.awt.Component.dispatchEvent(Component.java:2497)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:333)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)

This turned out to be because Sandeep had updated the test version of IM, and
though I had continued to use my current/existing running copy of IM, one
or more classes appear to have been kicked out of memory.
(Review ID: 114861)
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