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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>The filter is “ether
dst FF:02:FF:FF:FF:FF”. But setting to promiscuous mode solved it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Ryan<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>PS. Now I just
need to read more about promiscuous mode so I don’t make that mistake again…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> winpcap-users-bounces@winpcap.org
[mailto:winpcap-users-bounces@winpcap.org] <b>On Behalf Of </b>Gianluca Varenni<br>
<b>Sent:</b> 01 July 2008 17:44<br>
<b>To:</b> winpcap-users@winpcap.org<br>
<b>Subject:</b> Re: [Winpcap-users] pcap_next_ex() not receiving packets<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Which
capture filter do you use? Also, do you capture any packet if you set
promiscuous mode on (setting the promiscuous parameter of pcap_open_live to 1)?</span><span
style='font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Have
a nice day</span><span style='font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>GV</span><span
style='font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-----
Original Message ----- <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'> <a
href="mailto:ryan.fowler@thomsonreuters.com"
title="ryan.fowler@thomsonreuters.com">Ryan Fowler</a> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <a
href="mailto:winpcap-users@winpcap.org" title="winpcap-users@winpcap.org">winpcap-users@winpcap.org</a>
<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sent:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Tuesday, July 01,
2008 6:47 AM<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Subject:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> [Winpcap-users]
pcap_next_ex() not receiving packets<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'>I am trying to
receive packets using pcap_next_ex(), but for some reason I keep getting a
timeout. I know that packets are coming into the machine because I can
see them via WinDump. The odd part is that when I run WinDump
concurrently with my test application, I start to see packets in the test app
(as well as in WinDump). But without WinDump, I get no packets on the
test app at all.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'>I am guessing that
there is something I need to do to “start” the packet driver capturing,
although I thought that’s what pcap_open_live does, so I’m not quite sure on
that.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'>My code so far is
a fairly liberal sampling of the pktdump_ex example:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:green'>/* Open the adapter */<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>if</span> ((m_pSessionHandle = pcap_open_live(m_pReceiveDevice->name,
<span style='color:green'>// name of the device<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
65536, <span style='color:green'>// 65536 means
the whole packet will be captured.<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
0, <span style='color:green'>// non promiscuous mode (nonzero
means promiscuous)<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
1000,
<span style='color:green'>// read timeout<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
errbuf <span style='color:green'>// error buffer</span>))
== NULL)<span style='color:green'><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
// Error code<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
std::cout << <span style='color:#A31515'>"Filter: "</span>
<< m_strFilter << std::endl;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>if</span> ( !m_strFilter.empty() )<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
bpf_u_int32 NetMask = 0;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>struct</span> bpf_program fcode;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:green'>//compile the filter<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>if</span>(pcap_compile(m_pSessionHandle, &fcode, <span
style='color:blue'>const_cast</span><<span style='color:blue'>char</span>*>(m_strFilter.c_str()),
1, NetMask) < 0)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
// Error code<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:green'>//set the filter<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>if</span>(pcap_setfilter(m_pSessionHandle,
&fcode)<0)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
// Error code<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:green'>/* At this point, we don't need the device list any
more. Free it */<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
pcap_freealldevs(alldevs);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'>And later on:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>while</span>((res = pcap_next_ex( m_pSessionHandle,
&header, &pkt_data)) >= 0)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>if</span>(res == 0)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:green'>/* Timeout elapsed */<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
OutputDebugString(L<span style='color:#A31515'>"No packets!\n"</span>);<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>continue</span>;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><span
style='font-size:10.0pt;font-family:"Courier New"'>//…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:dotted silver 1.0pt;padding:4.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#666666'>Ryan Fowler</span></b><span style='font-size:10.0pt;font-family:
"Arial","sans-serif";color:#666666'><br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#666666'>Software Engineer</span><span style='font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:9.0pt;margin-right:0cm;margin-bottom:
9.0pt;margin-left:0cm'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:#F57F20'>Thomson Reuters</span></b><span style='font-family:"Times New Roman","serif"'>
<o:p></o:p></span></p>
</div>
</div>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'>_______________________________________________<br>
Winpcap-users mailing list<br>
Winpcap-users@winpcap.org<br>
https://www.winpcap.org/mailman/listinfo/winpcap-users<o:p></o:p></span></p>
</blockquote>
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