Re: [Fwd: [Saad] Some initiating thoughts...]

Brian E Carpenter <brc@zurich.ibm.com> Wed, 29 October 2003 16:36 UTC

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Date: Wed, 29 Oct 2003 17:33:45 +0100
From: Brian E Carpenter <brc@zurich.ibm.com>
Organization: IBM
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To: "Harrington, David" <dbh@enterasys.com>
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Subject: Re: [Fwd: [Saad] Some initiating thoughts...]
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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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