Re: [wg-pic] Tolly's Skype critique

["Carl S. Ford" <>]

I believe Henning has some analysis worth looking at.

Kind Regards,
carl
On Fri, 30 Sep 2005 14:27:37 +0200, Sven Abrahamse <>  
wrote:

> would be really nice to see what the inside scoop of skype is :-)
>  S
>
>  On 9/30/05, Doug Pearson 
> <>
>  wrote:
> > Anyone have a good reference to the inside technical details of how  
> > Skype
> > works?
> >
> > The Tolly article says "dearth of information available to us, we  
> > learned
> > most of what we know by studying Skype 'in the wild'"... but it doesn't
> > share much about those details.
> >
> > Doug Pearson
> >
> >
> > At 04:01 PM 9/29/2005 -0400, Ben Teitelbaum wrote:
> > >Candace Holman 
> > <>
> >  writes:
> > >
> > >> In this article, Tolly studied Skype peer-to-peer traffic to evaluate
> > >> the impact on network bandwidth. He quoted the Skype Web site on what
> > >> peer-to-peer means: "A true [peer-to-peer] system, in our opinion, is
> > >> one where all nodes in a network join together dynamically to
> > >> participate in traffic routing-, processing- and bandwidth-intensive
> > >> tasks that would otherwise be handled by central servers."  
> > Interesting
> > >> view. Tolly suggests that this means your Skype-enabled workstation
> > >> may be functioning as a traffic relay for otherwise-centralized call
> > >> processing, conferencing, voice mail, etc.
> > >
> > >That seems like a fair definition of "true peer-to-peer" to me. One
> > >of the big reasons that universities may see a lot of Skype traffic is
> > >the use of public IP addresses. Skype needs a share of its users to
> > >be non-NATted to serve as media relays for hosts behind
> > >tricky-to-traverse NATs.
> > >
> > >-- ben
> > >
> > >--
> > >Ben Teitelbaum http://people.internet2.edu/~ben/



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Carl Ford
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