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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'>If you set no filter (So all packets comes through) in your program, do any packets get captured on the VPN interface?<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> Wednesday, 2 June 2010 7:32 AM<br><b>To:</b> winpcap-users@winpcap.org<br><b>Subject:</b> Re: [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"'>Tahnks KB,</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I followed your advise but still encountered problems capturing the </span><span style='font-family:"Arial","sans-serif";color:#1F497D'>"PPP Interface that the PPPoE terminates on".</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Using Wireshark I did see the packets when using no filtering. I couldn't filter them nor with the port (8081 in this case) and nor with the type which is UDP.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Since my code also uses filtering that explains why my code dosn't capture either.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>So my question is now why can I see the packets if I don't filter(but if I watch them later I can see the UDP and the port which is 8081) but if I try to filter with the type or the port I don't see any packet?</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I. Lesher</span><o:p></o:p></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:kyle@connecttel.com.au" title="kyle@connecttel.com.au">Kyle Brotheridge</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:ceo@triplebit.com" title="ceo@triplebit.com">ceo@triplebit.com</a> ; <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"'> Monday, May 31, 2010 3:58 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"'> **SPAM** RE: [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: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></blockquote></div></body></html>