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From Gary Tully <>
Subject Re: multicast discovery and ?group=parameter
Date Mon, 25 May 2009 10:16:41 GMT
the default group name is "default" so a group attribute can override this.
Having no group parameter means that you are in the default group.
The group is used to multiplex on a single multicast address. Using a
different multicast address and the no (or the default) group parameter does
the same thing.
I think the only difference may be operational, if routers need to be
configured to allow more mutilcast packets through.

2009/5/25 Aleksandar Ivanisevic <>

> can someone explain or point to the explanation in the docs about the
> group parameter in multicast discovery?
> What is the difference between specifying different group and
> specifying a different multicast address?
> The reason why I'm asking is that I've seen connection attempts to my
> broker from clients having multicast://default?group=xxx, although it
> has no group parameter in the URI, only multicast://default.
> How is this supposed to work? no group means any group or what?


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