Re: Bittorrent

["Marco Bonetti" <marco.bonetti@xxxxxxxxxxxx>]

On Fri, February 20, 2009 15:02, Freemor wrote:
> but what gets reported to the tracker is your actual IP
> as without that the other peers would be unable to connect to you.
It's not that simple.

I've just took a look at
http://jonas.nitro.dk/bittorrent/bittorrent-rfc.html it's the first hit on
"bittorrent rfc", I hope it's ok :-P
As you can see at
http://jonas.nitro.dk/bittorrent/bittorrent-rfc.html#anchor18 the "ip"
field is totally optional (many bt clients let you specify your real ip,
usually after you enable a proxy setting), the tracker will identify your
client with the "peer_id", the "port" values and what you need from / have
to offer to the swarm.
The tracker response
(http://jonas.nitro.dk/bittorrent/bittorrent-rfc.html#anchor19) will send
you a list of peer_id/ip/port and your own entry will be composed of your
peer_id and and (non torified) port with the exit node ip.
Data exchange is described at
http://jonas.nitro.dk/bittorrent/bittorrent-rfc.html#anchor21 as you can
read the peers only check if the peer_id is a valid one (it is in the
tracker response), not if the ip address is a known one, in this way you
keep on reporting torified ips to the tracker and the real ip to the
clients you connect to.

Unless trackers will start accepting id/ip "corrections" from clients
(quite useless as it can lead to serious swarm damage as there's no strong
authentication mechanism) this method will grant you some anonymity.

ciao

-- 
Marco Bonetti
BT3 EeePC enhancing module: http://sid77.slackware.it/bt3/
Slackintosh Linux Project Developer: http://workaround.ch/
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