Re: [ledbat] list of reasons for needing multiple TCP connections

On Dec 1, 2008, at 7:06 PM, Richard Bennett wrote:

> Actually, this article in DSL Reports started the recent discussion  
> about BitTorrent over UDP:
>
> http://www.dslreports.com/shownews/New-UDP-uTorrent-Takes-Aim-At-Throttling-99366
>
> The title is: "New UDP uTorrent Takes Aim At Throttling". The  
> author, Karl Bode, is aware that UDP is one of the methods that P2P  
> programmers have discussed over the years for avoiding traffic  
> shaping. There's nothing particularly obscene about attempting to  
> work through the implications of trade-offs; this is what engineers  
> do.
>
> Several people have objected to the implication that the sole  
> purpose of making UDP the default transport was management evasion,  
> and I'll correct that notion in a follow-up piece. That being said,  
> there are still important issues to explore in relation to the  
> Internet infrastructure, for "whoever designs it."

We've had confirmation that the udp protocol being on-by-default in  
uTorrent is the same AIMD + delay-based that was presented at the IETF.

AIMD + delay-based means it can't make the ISP's congestion problem  
worse (it may make it better but thats an open question), but it  
definatly makes the access-link congestion better.

So rather than "getting around" traffic management (which doesn't work  
anyway), this is specifically about reducing the network impact,  
especially on the local access point.

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