Eric,
Thank you very much for the explanation. Since I haven't participated in the
ALTO discussion until recently, I am not aware that working group has
already reached consensus on the document. Seeing the document is only at
its Version 1, I thought the document is still at its early stage and open
for input.
I will take you suggestion on trying to draw a "better picture" and submit
to the working group for review. If no better picture can be agreed by the
working group, I would like to take your offer on putting the following
words into the document:
Figure 1 is only representative of the situation and, in
particular, does NOT enumerate any particular or favored implementation
strategy
Thanks, Linda Dunbar
-----Original Message-----
From: Eric Burger [mailto:ebur...@standardstrack.com]
Sent: Tuesday, June 02, 2009 8:31 AM
To: Linda Dunbar
Cc: alto
Subject: Re: Comments to "draft-ietf-alto-problem-statement-01"
You are entirely correct that the goal of this document is to lay out
the problem and not the solution. Moreover, it is unfortunate, yet
true, that one may interpret any pictorial representation of an
instantiation of ALTO services as a preferred method of deploying ALTO.
I would offer that your assertion that there may be issues with cross-
domain ALTO services is correct. I would also offer that these issues
are both solvable and possibly out of scope for ALTO.
However, we would offer that Figure 1 is only representative of the
situation and, in particular, does NOT enumerate any particular or
favored implementation strategy. Moreover, at a very high level, this
figure embodies the general approach taken by the work group and what
the IESG enumerated in our charter. At this point, our alternative is
to remove the figure. However, we put the figure in because a number
of people commented in prior drafts that we needed a figure. It is
our opinion (as members of the work group) that this is the best we
can do. If one has a better figure, please submit it. Otherwise, I
believe we have work group consensus to go forward with the document
as is.
On Jun 1, 2009, at 12:01 PM, Linda Dunbar wrote:
> Jan and Eric,
>
>
>
> I have following comments to the "draft-ietf-alto-problem-
> statement-01:
>
>
>
> The Figure 1 of the draft (i.e. the ALTO server providing client
> protocol to peers and Resource Directory) demonstrates a solution
> for the problem. But the title of the draft says that it is a
> Problem Statement, which should not dictate how solution should be.
> There are multiple ways for network layer to provide needed
> information to the application layer to optimize P2P traffic.
>
>
>
> Just from pure technical point of view, it is difficult for the ALTO
> server/client model to work well when the application peers are in
> different service provider domains for the following reasons:
>
>
>
> . Most likely the peers are in different ISPs. The proposed
> ALTO server/client model assumes that ALTO servers belong to certain
> ISPs. It is not a trivial task for one ISP's ALTO server to keep
> track of which ISPs the other peers belong to.
>
> . There is really no incentive for one ISP to optimize
> traffic for other ISPs. Why should one ISP invest effort to optimize
> other ISP's traffic?
>
>
>
> The ALTO group would allow people to explore different types of
> architecture to optimize the P2P traffic. Therefore, the description
> of the ALTO server/client and related protocol should not be part of
> this "Problem Statement" document.
>
>
>
> Best Regards, Linda Dunbar
>
> Advanced Technology Dept, Wireline Networks,
>
> Huawei Technologies, Inc.
>
>
>
>
>
>
>
>
>
> From: alto-boun...@ietf.org [mailto:alto-boun...@ietf.org] On Behalf
> Of Jon Peterson
> Sent: Friday, May 29, 2009 3:00 PM
> To: alto@ietf.org
> Subject: [alto] WGLC: draft-ietf-alto-problem-statement-01
>
>
>
>
> The chairs would like to declare a Working Group Last Call for draft-
> ietf-alto-problem-statement-01, beginning Monday June 1st and ending
> Monday June 15th.
>
> Please do review the latest version of the draft, and send any
> comments to the list before the expiry of WGLC so we can get this
> document ready for the IESG.
>
> Jon Peterson
> NeuStar, Inc.
>
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