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<DIV><FONT face=Calibri>Are you capturing on a standard ethernet/wireless
card?</FONT></DIV>
<DIV><FONT face=Calibri></FONT> </DIV>
<DIV><FONT face=Calibri>What parameters are you using with
pcap_open?</FONT></DIV>
<DIV><FONT face=Calibri></FONT> </DIV>
<DIV><FONT face=Calibri>Have a nice day</FONT></DIV>
<DIV><FONT face=Calibri>GV</FONT></DIV>
<DIV style="FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=Imre.Magyar@lairdtech.com
href="mailto:Imre.Magyar@lairdtech.com">Imre Magyar</A> </DIV>
<DIV><B>Sent:</B> Sunday, March 21, 2010 6:24 AM</DIV>
<DIV><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV><B>Subject:</B> [Winpcap-users] winpcap not capturing
anything</DIV></DIV></DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Hello
all,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I've spent a couple
weeks trying to figure this out on my own, but to no avail and no amount of
searching seems to help me find answers, so I'm hoping somebody out there can
help.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">I have a Windows .Net
application that uses multiple managed Visual C++ DLLs, one of which interfaces
to winpcap. The program model is fairly simple; upon entry to the DLL I open the
interface with pcap_open(), spawn a separate thread to repeatedly call
pcap_next_ex() while the main thread returns to managed context to continue the
main application thread.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">The problem is that
pcap_next_ex() never manages to see a single packet. Running wireshark on the
same interface simultaneously verifies that the packets are on the wire, but I
never see a single one.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">But it gets stranger,
because everything works fine on some Windows PCs (all running XP) yet this
happens reliably on others.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">If I take the DLL
code and change it such that it's run as a standard standalone WIN32
application, everything works perfectly, so I think that the problem isn't
winpcap itself, just something having to do with the .net application
contexts.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">So at the risk of
asking about something that is obvious to everyone else, could someone please
help me with some ideas as to what's going on?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Thank-you!<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">--Imre
M.<o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<P>
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