[bittorrent] BT proxy

larytet.8708132 at bloglines.com larytet.8708132 at bloglines.com
Tue Apr 12 13:18:08 EDT 2005

I am going to use regular URL based GET DATA requests and GET DATA ack to
help exisitng equipment to cahche the data (yes, this is just another non-compatible

--- Andrew Brampton" <andrew at bramp.freeserve.co.uk wrote:
I believe
there was a commercial product that claims BitTorrent proxying
> It was
a transparent proxy that would watch all BitTorrent connection. It
> would
identify them as BitTorrent by either port inspection (ie 6881-) or by
packet inspection (I believe its trivial to watch the first 20 bytes for
> "BitTorrent Protocol").
> Once it is watching a connection it will
associate that TCP Flow with the
> Torrent's hash (which it saw in a first
packets). Then every time it sees a
> piece message it would keep a copy
of the data inside. Now next time another
> client is transparently connected
to the same BitTorrent swarm the proxy can
> intercept all outgoing request
packets and return the piece itself (as long
> as it already has it cached).

> This concept is very similar to a web proxy except in this case the
BT Proxy
> is doing anything transparently, and never actually making any
requests to
> the outside world.
> I believe the commercial product
that does this was aimed at ISPs that
> wanted to cache P2P traffic inside
their own network to save themselves
> external bills.
> The idea is
sound, and would be a nice Open Source project that university
> campus or
business networks etc could use.
> Andrew
> ----- Original Message
> From: "David P. Mott" <dpmott at sep.com>
> To: <bittorrent at lists.ibiblio.org>

> Sent: Tuesday, April 12, 2005 3:58 PM
> Subject: [bittorrent] BT proxy

> >
> > Some people have brought up the need for a BT proxy, but
all attempts at 
> > discussion on that topic were more or less ignored on
the yahoo forum. The 
> > quote that comes to mind is that "a BT proxy is
an unfirewalled BT 
> > client" -- which shows that the author either didn't
grasp the real need 
> > for a true proxy, or didn't care.
> >
> > Thanks,

> > -dpmott
> > 
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