[bittorrent] bittorrent] One connection for download and upload?

Alan McGovern alan.mcgovern at gmail.com
Thu Nov 2 13:02:32 EST 2006


There's no point in not using the same connection to both send and receive
data. No program that i know of would use a seperate socket to send data and
receive data from the the same host, it's inefficient and awkward.


(forgot to hit "reply to all" the first time, sorry)

On 11/2/06, Michael Parker <mgp at ucla.edu> wrote:
> On Nov 2, 2006, at 8:22 AM, Yao-Chin Wu wrote:
> > Dear all,
> >
> >     I am a college student and doing a project related to P2P
> > structure. Bittorrent is a excellent resource for us, and we are
> > trying to understand its code as much as possible.
> >
> >     Accroding to the Bittorrent client implemented by Bram Cohen,
> > it looks like using only one connection when peer A is downloading
> > a piece from peer B and peer B also wants to download a piece from
> > peer A ( one connection for downloading and uploading also). Is
> > that correct? Is there other implementatioins using seperated
> > connections for this situation? Which one may be better? Thank you
> > for your help!
> >
> Yes, the standard is that there is only one connection between them.
> I don't think there's much point to separated connections for
> uploading and downloading -- by using a single connection you can cut
> the overhead from the TCP headers in half. Also, if two different
> connections were used, that gives me the impression that each side is
> responsible for creating one of the connections (although not
> necessarily). But with the prevalence of NATs and firewalls today,
> you'd be running a greater risk of one side not being able to connect
> at all, and hence one side not being able to download or upload at all.
> - Mike
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