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

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


Hi,

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.

Thanks,
Alan.

(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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