I concur completely with Phil's position here. OPES was originally
predicated on the
existence of a Content Network. My understanding is, it still is. The
Content Network
can be as simple as a single caching proxy or as complex as CDN.
Gary
-----Original Message-----
From: Phil Rzewski [mailto:philr(_at_)inktomi(_dot_)com]
Sent: Tuesday, November 27, 2001 4:27 PM
To: Reinaldo Penno
Cc: 'ietf-openproxy(_at_)imc(_dot_)org'
Subject: RE: Draft on Callout Protocol Requirements
At 03:22 PM 11/27/2001 -0800, Reinaldo Penno wrote:
-----Original Message-----
From: Phil Rzewski
[<mailto:philr(_at_)inktomi(_dot_)com>mailto:philr(_at_)inktomi(_dot_)com]
Sent: Monday, November 26, 2001 11:34 AM
To: Penno, Reinaldo [SC9:T327:EXCH]
Cc: ietf-openproxy(_at_)imc(_dot_)org
Subject: RE: Draft on Callout Protocol Requirements
<snip>
In brief, we know that in the routed world, once you put two
host machines on
the same ethernet wire, you technically have a "network". As
"networks" go,
it's on a whole different scale than one operated by AT&T or
the IT department
at your local enterprise, but this is why we have terms like
"public backbone
network", "LAN", "VPN", etc. Similarly, we would argue that
once you add ANY
proxy ("forward" or "reverse") you have created a type of
Content Network.
okay, I can agree with that since it actually adds to my point that to
have
OPES you only need
IP connectivity, nothing else. You do not need an CN (and not by a long
shot
a CDN) overlay network in place BEFORE you install OPES devices.
I'm not sure how you get that from what I said, though maybe I'm failing to
understand something. Back when I was first tracking OPES, the services were
assumed to be provided by either proxylets or callouts to external boxes.
The
device that was making those callouts or calling those proxylets was
typically
described as being a surrogate or proxy of some kind. If that's still true
(is
it not?), then by my definition, you WOULD have a Content Network before you
layer OPES proxylets/callouts on top of it.
You end up having a CN (not an CDN) overlay network AFTER you install an
OPES
device.
This I'd agree with, but I'm agreeing with the literal statement. :) That
is,
I'd say that any network that contains OPES services is a Content Network (I
think it had to be before you added the OPES services, even). It may be a
CDN,
since a CDN is just a specific type of Content Network. That's determined by
whether it contains components like distribution, request routing, etc.
--
Phil Rzewski - Senior Architect - Inktomi Corporation
650-653-2487 (office) - 650-303-3790 (cell) - 650-653-1848 (fax)