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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'>It is important to disable IPv6 router advertisements in each interface. Otherwise all workstation connected to that interface will configure EUI-64 IPv6 address. (only if complete network is NOT IPv6 compliant)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In Cisco ipv6 nd suppress-ra under interface will do.<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'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Randil<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 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>Scott Howard<br><b>Sent:</b> Monday, 20 May 2013 2:07 PM<br><b>To:</b> terry@skymesh.net.au<br><b>Cc:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] IPv6 reverse DNS and Mail ...<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>How many of these are from people that are actually aware that they are actually using IPv6 for email?<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've seen this countless time where people enabled IPv6 on their local network, and their mail server automatically started attempting to use it for delivery. At least one major appliance vendor also has this problem - as soon as it found an IPv6 router being advertised, it would attempt to deliver all mail over IPv6 to any host with an AAAA address - all sourced from it's auto-configured address with no reverse DNS...<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> Scott<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Sun, May 19, 2013 at 8:55 PM, Terry Sweetser (SkyMesh CTO) <<a href="mailto:terry+AusNOG@skymesh.net.au" target="_blank">terry+AusNOG@skymesh.net.au</a>> wrote:<o:p></o:p></p><p class=MsoNormal>Hello NOGGERS,<br><br>At SkyMesh, we routinely get "submissions" from remote mail admins to stop blocking their email.<br><br>It turns out on many occasion that the remote site has ipv6, no reverse dns, and is connecting to our MX farm on ipv6.<br><br>So, if you're running an outbound mail server or farm of servers and start using ipv6, do the rest of us a big favour:<br><br>Get your rev.dns set up on those servers.<span style='color:#888888'><br><br><span class=hoenzb>-- </span><br><span class=hoenzb><a href="http://about.me/terry.sweetser" target="_blank">http://about.me/terry.sweetser</a></span><br><br><span class=hoenzb>_______________________________________________</span><br><span class=hoenzb>AusNOG mailing list</span><br><span class=hoenzb><a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a></span><br><span class=hoenzb><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a></span></span><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>