[BitTorrent] Plans for Multicast?

Justin Cormack justin at street-vision.com
Mon Jan 17 11:45:17 EST 2005


> 
> 
> 
> Hi,
> I've looked at how BitTorrent work. It is a very good protocol design.
> 
> But if I look at my Upload/Download-ratio from Bittorrent and from my
> last-mile-ADSL I'm missing support for an parallel-existing and
> cross-excanging[1] multicast deployment tree where possible.
> 
> In fact I think on an hybrid protocol between (Fat)Nemo[2] and
> BitTorrent[3].
> 
> As an given Example see [4]. Distribute torrents over the Internet per
> Unicast and within the (NAT-less) LAN over Multicast[5]. For End-Users
> it is currently not really possible to distribute files in these
> manner because of the lack of Applications doing so.
> 
> Are there any plans to implement such a feature?

BT works best if peers have different blocks, and as peers that are on
networks that support multicast are normally on local lans where traffic is
cheap compared to offsite traffic, multicast does not offer much benefit.

If long haul routed multicast existed things might be different.

Justin

> 
> Sincerly,
> MovGP0
> 
> [1] Meaning that unicast-nodes exchange data with multicast-nodes over
>     unicast channels for backward compatibility.
> [2] http://www.aqualab.cs.northwestern.edu/Nemo.html
> [3] http://bittorrent.com/introduction.html
> [4] http://groups.yahoo.com/group/BitTorrent/message/6065?threaded=1
> [5] I think also on a kind of (auto-setup) streaming-proxy.
> [6] http://groups.yahoo.com/group/BitTorrent_help/message/9656
>     ?threaded=1
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 



 
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