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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Lesher,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Please explain a bit more. From my understanding you have a PC connected to a LAN, and a PPPoE connection terminating on the same PC via its local NIC.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You CAN capture LAN traffic, but CANNOT capture traffic from the PPPoE connection?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>From this I’d say it’s because the packets from the PPPoE are encapsulated in PPP/GRE, if you’re looking to capture the packets contained within the PPP stream, you’ll have to capture on the PPP Interface that the PPPoE terminates on.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-KB<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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>ceo@triplebit.com<br><b>Sent:</b> Saturday, 29 May 2010 7:21 PM<br><b>To:</b> winpcap-users@winpcap.org<br><b>Subject:</b> [Winpcap-users] Capture fails in pppoe enviroment<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:"Arial","sans-serif"'>Hi all,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I use WinPcap 4.02 to capture stream source and to process the data somehow.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>It works fine if the source is inside a LAN.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>On the other hand, when source is in a pppoe Internet connection, I capture the Ethernet card that supports the Internet connection and I get no packet captured. The following while loop simply never enters the loop as it does in a LAN environment.<o:p></o:p></span></p><p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>while</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>((res = pcap_next_ex( adhandle, &header, &pkt_data)) >= 0)<o:p></o:p></span></p><p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>{<o:p></o:p></span></p><p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>if</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>(res == 0)<o:p></o:p></span></p><p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:green'>/* Timeout elapsed */<o:p></o:p></span></p><p><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>continue</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>;<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>However in a Wireshark I can definitely see the expected packets om this same card.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The algorithm is similar in both environments and it based on the samples following the product.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Has anyone any idea what could be the cause?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I. Lesher</span><o:p></o:p></p></div></div></body></html>