[BitTorrent] Re: Free rider problem

guanying_wang guanying_wang at yahoo.com.cn
Mon Dec 27 08:46:30 EST 2004



--- In BitTorrent at yahoogroups.com, Elliott Mitchell <ehem at m...> wrote:

> Not quite right. Multiple peers /could/ be NATed behind a single IP
> address. If these are bandwidth limited individually behind the NAT, you
> could get better bandwidth talking to both. At the same time if you
throw
> out the port, then you could end up unchoking the wrong one.
> 
Thank you for reply.  Forget about my solution, since it's so
vulnerable.  How about the FREE-RIDER problem I mentioned?  I can get
everything without uploading a bit!

> At the same time you should be controlling optimistic unchokes to on a
> per-address basis so that you avoid the above. This then gets
interesting
> that an attacker with multiple IP addresses (either all on one
machine or
> a cluster of systems) could do a group attack against you. Also with a
> sufficiently large swarm you could avoid reconnecting to the same peer
> twice.
> 
I can't get your point well.  How to get exact list of peers without
repeat and drop?






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