Re: [p2pi] Information in an ALTO protocol

[Vinay Aggarwal <[e-mail]>]

Hello,

Regarding what information the ALTO service can provide:

I think an estimate of "last-hop bandwidth" can be an interesting metric
of information for peer selection.
It has been shown that selecting peers with high last-hop bandwidth lead
to improvements in download performance. And this is information that is
rather hard for peers to find out themselves. As far as I can see, it
also satisfies all the bars set up by the ALTO service.

Any thoughts?

Thanks,
Vinay.

-----------------
Vinay Aggarwal
Deutsche Telekom
Germany.


On Thu, Aug 07, 2008 at 09:14:19PM +0200, Enrico Marocco wrote:
> As some people suggested, it may be useful to try to understand what
> kind of information will be provided by an ALTO service.
> 
> Current version of the charter lists four pieces of information:
> + routing preferences and priority values. The network operator is
>   usually the only entity in possession of such information, but it is
>   in its interests to share at least part of it with applications, in
>   order to reduce traffic on critical links. On the other hand, if
>   following such preferences leads to better-than-random choices, it is
>   also in applications' interest to follow them;
> + AS numbers and approximate geographic locations. Such information is
>   today (partially) available and, in fact, is in some cases already
>   used for peer selection. However, since there is no standard way to
>   obtain it, it is not easy for applications to switch from an
>   information provider to another.
> 
> The charter does not preclude any other kind of information entirely,
> but it sets the bar pretty high, requiring that:
> 
>   When the WG considers standardizing schemas, measures or other
>   information that the ALTO service could provide, the following
>   criteria are important to ensure real feasibility.
>   - Can an ALTO service technically provide that information?
>   - Is the ALTO service willing to obtain and divulge that information?
>   - Is it information that some client will find useful?
>   - Can that client get that information without excessive privacy
>     concerns (e.g. by sending large lists of peers)?
>   - Is it information that clients cannot find easily some other way?
> 
> Thoughts?
> 
> -- 
> Ciao,
> Enrico



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