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</o:shapelayout></xml><![endif]--></head><body 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'>We had a customer that P2V a server then moved the server to the other side of the side and used it as a backup file server. Then then wondered why their network had all these intermittent issues. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There have also been many clones of products and they do such a good job at copying the original they even copy the MAC address. Dreambox’s come to mind and there have been ROM from XDA developers that set the MAC addresses all to the same address too.<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><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thank you<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Andrew Paternoster<o:p></o:p></span></p></div><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"'> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Josh Carter<br><b>Sent:</b> Thursday, 7 February 2013 9:34 AM<br><b>To:</b> ausnog@ausnog.net<br><b>Subject:</b> Re: [AusNOG] The occurrence of duplicate MAC addresses<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'>I’ve personally diagnosed an issue with 2 store bought PC’s of the same brand bought on the same day which had identical MAC addresses… </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Marvelled at the time that the odds of that happening are somewhat astronomical, though perhaps not quite so astronomical as first thought… </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>--JC</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></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"'> <a href="mailto:ausnog-bounces@lists.ausnog.net">ausnog-bounces@lists.ausnog.net</a> [<a href="mailto:ausnog-bounces@lists.ausnog.net">mailto:ausnog-bounces@lists.ausnog.net</a>] <b>On Behalf Of </b>Lloyd Wood<br><b>Sent:</b> Thursday, 7 February 2013 8:24 AM<br><b>To:</b> Mark Smith; <a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a><br><b>Subject:</b> Re: [AusNOG] The occurrence of duplicate MAC addresses</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><div><div><p class=MsoNormal style='background:white'><span style='color:black'>Colleagues have horror stories about debugging running into MAC address conflicts in the field with IPv4.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='color:black'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='color:black'>"Oh, we weren't expecting you to ship them to a different region!"</span><o:p></o:p></p></div><div><p class=MsoNormal style='background:white'><span style='color:black'> </span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='color:black'>Lloyd Wood<br><a href="mailto:lloyd.wood@yahoo.co.uk">lloyd.wood@yahoo.co.uk</a></span><o:p></o:p></p></div><div><div><div><div class=MsoNormal align=center style='text-align:center;background:white'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><hr size=1 width="100%" align=center></span></div><p class=MsoNormal style='background:white'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> Mark Smith <<a href="mailto:markzzzsmith@yahoo.com.au">markzzzsmith@yahoo.com.au</a>><br><b>To:</b> "<a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a>" <<a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a>> <br><b>Sent:</b> Wednesday, 6 February 2013, 21:29<br><b>Subject:</b> [AusNOG] The occurrence of duplicate MAC addresses</span><o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt;background:white'><span style='color:black'><br>Hi,<br><br>There's been a discussion over the last few days on the IETF IPv6 6man (IPv6 maintenance) mailing list regarding the use of MAC addresses to generate IPv6 Interface Identifiers. One of the issues relates to how unique MAC addresses are.<br><br>Following on from "The Wild West" presentation I posted the other day, I emailed HD Moore to see if I could get some numbers regarding numbers of occurrences of duplication of individual MAC addresses. HD got back to me today, I've posted them at the following mailing list archive URLs. Make sure you're sitting down.<br><br><a href="https://www.ietf.org/mail-archive/web/ipv6/current/msg17105.html" target="_blank">https://www.ietf.org/mail-archive/web/ipv6/current/msg17105.html</a><br><br><br><a href="https://www.ietf.org/mail-archive/web/ipv6/current/msg17105.html" target="_blank">https://www.ietf.org/mail-archive/web/ipv6/current/msg17105.html</a><br><br><br>Regards,<br>Mark.<br>_______________________________________________<br>AusNOG mailing list<br><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><br><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a></span><o:p></o:p></p></div></div></div></div><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>==== Charter Hall ========================<br>This e-mail message and any accompanying attachments may contain information that is confidential and subject to legal privilege. 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