Dear WinPcap's contributors,
I'm developing an application to send/receive packets by using
WinPcap 3.0 through wireless LAN. During my test of the program,
I found the following two strange behaviours probably caused by
WinPcap 3.0. I shall appreciate any suggestions or clues from you.
1) My program caused BSOD when the application sends and
receives packets at the same time. I have solved this problem by
changing the "npf.sys" driver to the one that Loris sent to us in
the email titled "npf.sys BSOD".
According to the explanation in email, there is a bug in WinPcap
3.0 driver in which the driver might return from a write before all the
packets are sent. That can cause the blue screen.
After I apply the new driver, the BSOD disappeared. But the
program
shows a strange behaviour, that is when the application continuously
sends
packets by using "for loop" to send them one by one, sometimes there is
a 3 - 4 sec. delay between two packets. This behavious've never occured
if I use the old driver that come with WinPcap 3.0. The send function
that
I'm using is "pcap_sendqueue_transmit" with the sync parameter on. Are
there any changes in "pcap_sendqueue_transmit" on the kernel level in
the BSOD-fixed driver ?
2) My application cannot send packets properly directly after the
application make an association to the AP, but it comes to work properly
when the time pass. For example, when I sent ten packets directly after
the association, the destination machine got only 3 packets and the rest
of them were junk packets.
This behaviour occurs only in WinPcap 3.0. I try to recompile my
program by using WinPcap 3.01 alpha and run it again on WinPcap 3.01
alpha's drivers. Surprisingly, it worked properly, all correct packets
were
sent, no junk ! The send function that I'm using here is
"pcap_sendqueue_
transmit". Are there any difference in "pcap_sendqueue_transmit"
between
WinPcap 3.0 and WinPcap 3.01 alpha ?
Thanks in advance,
Rujipun
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