David,
Virtual organizations are a fundamental feature of grid computing. A group
of users scattered around a selection of sites come together to tackle
a particular problem during a particular period of time. (In existing grids
it would typically be a particular computational scientific problem.) During that
time they pool their resources across organizations and these resources (servers,
storage, etc) need to communicate transparently among themselves as if they were
a single physical site, separate from their normal organizational affiliation
(i.e. NATs and firewalls are a big barrier, so today's addressing and security
model is a problem). You could conceive this as a set of VPN connnections but
that is a clumsy way to actually implement it.
There is some discussion of virtual organizations at
https://forge.gridforum.org/docman2/ViewProperties.php?group_id=42&document_content_id=919
Brian
"Harrington, David" wrote:
>
> Hi Brian,
>
> I'm having difficulty understanding the use-case scenario. Can you
> expand on a scenario when this would be needed so I can better grasp
> your point?
>
> Thanks,
> dbh
>
> > -----Original Message-----
> > From: Brian E Carpenter [mailto:brc@zurich.ibm.com]
> > Sent: Wednesday, October 29, 2003 6:00 AM
> > To: saad@ietf.org
> > Subject: Re: [Fwd: [Saad] Some initiating thoughts...]
> >
> >
> > Leslie Daigle wrote:
> > >
> > > I posted this a few days ago -- before, I think, people had
> > > a chance to get subscribed. So, let me re-post it for
> > > further discussion...
> >
> > And I've been carrying the attached minor comment around for
> > two weeks...
> > ...
> > >
> > > 3.2. Addressing Requirements of Enterprises
> > ...
> > > Some enterprises have addressing requirements caused by the
> > need to set
> > > up inter-enterprise Virtual Private Networks (VPNs). Also, at some
> > > point in their existence most enterprises undergo some form
> > of merger or
> > > acquisition, and discover that they need to merge internal
> > networks. In
> > > both these circumstances there is a requirement to avoid the need to
> > > renumber or to suffer from ambiguous addressing resulting from the
> > > merger of two private address spaces.
> >
> > I think this misses another related requirement that may become very
> > significant, in a future consisting of virtual organizations
> > and on-demand
> > computing environments. It may often be required for a set of
> > enterprises
> > to create a short-term "closed user group" of hosts that need
> > transparent
> > (firewall-free) interconnection for a period of time; this is
> > like a dynamic
> > merger followed some time later by a demerger. This is more
> > demanding on the
> > addressing (and routing) architecture than relatively static
> > VPNs or one-time
> > events like mergers.
> >
> > Brian
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