[bittorrent] [Bittorrent] Peer Wire Protocol silly question...

Olaf van der Spek olafvdspek at gmail.com
Tue Sep 20 07:55:25 EDT 2005

On 9/20/05, Justin Cormack <justin at street-vision.com> wrote:
> On Tue, 2005-09-20 at 13:36 +0200, Olaf van der Spek wrote:
> > On 9/20/05, Justin Cormack <justin at street-vision.com> wrote:
> > > There is no request bitfield - the peer should send it to you after the
> > > handshake finishes. If not that means that the peer has no pieces. Is
> > > the peer disconnecting? If so you have probably got an incorrect
> > > handshake. If not the peer probably has no pieces. Try sending the
> > > keepalive message (4 zero bytes) and see if you get that back from the
> > > peer.
> >
> > Is sending a keep alive related to receiving one?
> Thats a good question.
> The spec says
> Messages of length zero are keepalives, and ignored. Keepalives are
> generally sent once every two minutes, but note that timeouts can be
> done much more quickly when data is expected.
> Which is rather vague. Ignored suggests that they are ignored. But the
> implication is that you are using them to timeout somehow. If they are
> just ignored they are pointless, as you could just use TCP keepalives.

Do all (major) platforms support TCP keep alives?

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