On 7/13/2011 11:46, Francois PIETTE wrote:
AFAIR the workaround was to do your own ARP request first in order
to check whether the destination exists or not, utilizing the IP
Helper API.
Yes, that what I did.
How can I confirm that this is what's happening with me?
In my case, the blocking was occuring in the main thread. TO see it
it was then easy: using the mouse, I moved continuously the form in
small circles. When blocked, the application don't paint the form
and the window was stuck. Then using WireShark I was able to see
that the blocking was when ARP requests were sent to non existant
address.
I just did the same test and can confirm this is the case. The call
to closesocket() is blocking until all 3 arp requests have been sent.
Now the interesting part is that on another Windows 7 machine the
call to closesocket() is not blocking. When looking with wireshark I
see that the 3 arp requests are sent, but closesocket() simply does
not wait for them.
I'm happy you see the same behaviour as I do.
I did a compare of winsock.dll and ws2_32.dll from both machines, and
they are identical.
Does anybody have a good idea how to search for the cause for
different behavior, or have an idea where it could originate from?
Could it be something related to the chipset?
I don't think it is a hardware issue. It is likely a software issue.
One of the layer between winsock and the network card has a bug. That
is why you see it on one computer and not another.
Determining which layer is faulty will be a difficult task ! I don't
know what to say to help you :-(
I agree that it's not a hardware issue. Do you know what layers are
there approximately? I've already ruled out the driver of the NIC itself.
I was mentioning the chipset since there is also software applicable
(driver of the chipset). Also strange is that I have more machines of
same brand and model, which do not show the same behavior.
It's a nice mystery :)
Anyways, I have somebody coming over to replace the motherboard in this
machine, as a tryout.
I'll keep the list posted if I find more information myself.
regards,
Merijn
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