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From: Steven Woody on 1 Jul 2008 05:16
Hi,

If two TCP stream socket opened on two different hosts connected ok,
then the network cable was cut off. One endpoint will in sometimes
write some data into its socket. Of course, these packets sent out
will not get any ACKs, my question is: in this case, will the socket
in the sending end noticed this kind of failure and close the socket
for the calling program? If so, how long will this happen?
(Supposing the keeep-alive option is off)

Thanks.

-
narke
From: David Schwartz on 1 Jul 2008 06:12
On Jul 1, 2:16 am, Steven Woody <narkewo...(a)gmail.com> wrote:
> Hi,
>
> If two TCP stream socket opened on two different hosts connected ok,
> then the network cable was cut off.  One endpoint will in sometimes
> write some data into its socket.  Of course, these packets sent out
> will not get any ACKs, my question is: in this case, will the socket
> in the sending end noticed this kind of failure and close the socket
> for the calling program?  If so, how long will this happen?
> (Supposing the keeep-alive option is off)

Yes, the error will be "send timed out" or its equivalent. The exact
amount of time depends upon the exact settings on each end, but 50
seconds to 4 minutes is typical.

Note that TCP does not guarantee that an end that does not send data
can detect a connection loss. The connection is only tested so long as
there is unacknowledged outbound data.

DS
From: Steven Woody on 3 Jul 2008 01:37
On Jul 1, 6:12 pm, David Schwartz <dav...(a)webmaster.com> wrote:
> On Jul 1, 2:16 am, Steven Woody <narkewo...(a)gmail.com> wrote:
>
> > Hi,
>
> > If two TCP stream socket opened on two different hosts connected ok,
> > then the network cable was cut off. One endpoint will in sometimes
> > write some data into its socket. Of course, these packets sent out
> > will not get any ACKs, my question is: in this case, will the socket
> > in the sending end noticed this kind of failure and close the socket
> > for the calling program? If so, how long will this happen?
> > (Supposing the keeep-alive option is off)
>
> Yes, the error will be "send timed out" or its equivalent. The exact
> amount of time depends upon the exact settings on each end, but 50
> seconds to 4 minutes is typical.
>
> Note that TCP does not guarantee that an end that does not send data
> can detect a connection loss. The connection is only tested so long as
> there is unacknowledged outbound data.
>
> DS

Thank you. I understood.
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