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From: markspace <markspace@nospam.nospam>
Newsgroups: comp.lang.java.programmer
Subject: Re: single instance
Date: Wed, 16 Jan 2013 13:01:33 -0800
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On 1/16/2013 10:46 AM, Roedy Green wrote:
> On Wed, 16 Jan 2013 08:46:42 -0800, Knute Johnson
> <nospam@knutejohnson.com> wrote, quoted or indirectly quoted someone
> who said :
>
>>
>> Same IP and port.
>
>   But how far does this ripple?
>


As far as I know, it only works on your network segment.  Only for 
machines connected to the same physical router or gateway.

The multicast stuff is really more of a router protocol.  A machine 
broadcasts to one or more addresses, and the routers along the way take 
care of passing the stream to interested client machines.

Also note that as far as I know, absolutely no routers implement this. 
It's a dead protocol.