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<p class="MsoNormal"><span style="color:#1F497D">I experimented a bit with the NOCAPTURE_LOCAL flag, I can confirm that it doesn’t work properly on Win8, and as of now there is no workaround. The issue is rooted in the fact the WinPcap driver uses a very old
driver technology (NDIS5), which means that on Win8 there are a number of shim layers to transforms the notifications of the Win8 NDIS stack into the NDIS5 format (and viceversa), and it looks like the “noloopback” flag when sending packets is simply ignored.
There are some workarounds that I can try to make it work, but so far I’ve been quite unsuccessful. My current plan is leave it as a known bug, with two possible approaches:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">No code changes. The PCAP_OPENFLAGS_NOCAPTURE_LOCAL is ignored, and you will still receive loopback’d packets<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Fail the pcap_open request on win8 if the PCAP_OPENFLAGS_NOCAPTURE_LOCAL flag is set. This can potentially break applications that are using this flag even if they don’t need to.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Have a nice day<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">GV<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span 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> Thursday, January 24, 2013 10:35 AM<br>
<b>To:</b> winpcap-users@winpcap.org<br>
<b>Subject:</b> Re: [Winpcap-users] Windows 8<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Not sure. I need to understand why it’s not working properly on Win8.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">GV</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span 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>Paul Bußmann<br>
<b>Sent:</b> Thursday, January 24, 2013 1:19 AM<br>
<b>To:</b> winpcap-users@winpcap.org<br>
<b>Subject:</b> Re: [Winpcap-users] Windows 8</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Thank you very much for this information!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Do you think that PCAP_OPENFLAG_NOCAPTURE_LOCAL will be supported on Windows 8?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> winpcap-users-bounces@winpcap.org [mailto:winpcap-users-bounces@winpcap.org]
<b>Im Auftrag von </b>Gianluca Varenni<br>
<b>Gesendet:</b> Mittwoch, 23. Januar 2013 20:48<br>
<b>An:</b> winpcap-users@winpcap.org<br>
<b>Betreff:</b> Re: [Winpcap-users] Windows 8</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">There will be, most probably by mid/end February.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">GV</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a> [<a href="mailto:winpcap-users-bounces@winpcap.org">mailto:winpcap-users-bounces@winpcap.org</a>]
<b>On Behalf Of </b>Paul Bußmann<br>
<b>Sent:</b> Wednesday, January 23, 2013 4:51 AM<br>
<b>To:</b> <a href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br>
<b>Subject:</b> [Winpcap-users] Windows 8</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hello,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I found this question already in the archive:
<a href="http://www.winpcap.org/pipermail/winpcap-users/2012-July/004629.html">http://www.winpcap.org/pipermail/winpcap-users/2012-July/004629.html</a> although it seems to be unanswered since six months.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Unfortunately I didn’t find a roadmap on winpcap’s website.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I’d like to push this thread, because I need to know
<b><u>“Is there going to be a new version of WinPCap that installs on Windows 8?”</u></b>.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Paul</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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