[AG-TECH] Lurkers in the venues

shudo at ni.aist.go.jp shudo at ni.aist.go.jp
Wed Jan 30 21:41:09 CST 2002

This discussion brought up one question in my mind. AG
venues set up by Argonne people keep 20 or more IP
multicast group addresses. Why those numbers
(eg. for AG Lobby) are choosen? Are they
reserved? Are they compliant with the following

| Subject: Re: [AG-TECH] Virtual Venues Server Software
| From: Robert Olson <olson at mcs.anl.gov>
| Date: Tue, 15 Jan 2002 08:30:09 -0600

| If your site has an Autonomous System number assigned, you have 256
| addresses of class D space to play with. See http://www.ogig.net/glop/ for
| a calculator to tell you them.

> It's probably not worth worrying about for most of the conversations
> taking place, but I just want to make certain that everyone is clear on
> this... even if there are no apparent "lurkers" in a Virtual Venue,
> there is no guarantee that someone else is not listening.  Although it
> may not be likely, someone could join the multicast groups associated
> with a VV and eavesdrop, right?  Just because the Vic and RAT interfaces
> don't show someone else in the "room" doesn't mean it is secure.
> Jeff

  Kazuyuki Shudo		shudo at ni.aist.go.jp
  Grid Technology Research Center
  National Institute of Advanced Industrial Science and Technology (AIST)

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