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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;mso-fareast-language:EN-US'>I haven’t yet, I don’t have another handy but it’d be odd that it would start now, though maybe I have a line problem paired with a bug.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>I have a bunch of really good test items to check, I’ll monitor for a layer 1 problem for now and go from there while I wait for the ISP to do their thing.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Thanks to everybody for the awesome advice, I’ll keep you posted </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US'>J</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#333333'>Ayden Beeson<i> </i></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext'> AusNOG [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Paul Brooks<br><b>Sent:</b> Wednesday, 10 September 2014 2:40 PM<br><b>To:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] Strange ADSL problem - troubleshooting / diagnosis advice wanted<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 10/09/2014 1:55 PM, Beeson, Ayden wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>I’ll have another look at actual router level access from the WAN but I’d still see it in my netflow collection from that interface.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>I’m 99.99% percent it isn’t coming from me or even to me directly, I thought the same as you and did a lot of digging to double check.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>I have both SNMP and Netflow monitoring and logging configured on the modem and neither show any significant activity during these time periods on either the up or the downstream. </span><o:p></o:p></p></blockquote><p class=MsoNormal style='margin-bottom:12.0pt'>It may be a re-training bug between your modem and the DSLAM. ADSL2+ is supposed to re-train to a new sync rate seamlessly without packet drops, whereas the older ADSL1 had to effectively drop the line, re-sync, generate a new bitfield table per tone to cope with changes to background noise and cross-talk that caused a need for a re-sync. <br>Perhaps there is a bug causing the DSLAM and the modem to become confused about the number of bits per tone, and which bits go in which DSL tone, on the transmission path. That would cause a very high bit-error-rate, causing packets to be dropped when checksums and fields come through corrupted.<br><br>Have you tried a different make/model DSL modem?<br><br>P.<o:p></o:p></p></div>
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