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

Brian E Carpenter <brc@zurich.ibm.com> Wed, 29 October 2003 11:05 UTC

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Date: Wed, 29 Oct 2003 11:59:48 +0100
From: Brian E Carpenter <brc@zurich.ibm.com>
Organization: IBM
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Subject: Re: [Fwd: [Saad] Some initiating thoughts...]
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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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