<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hi Ivan et. al, On top of these problems add the incorrect RFC behavior of MS (i.e. Win 7) clients when dealing prefixes whose lifetime is set to 0) and you end up puzzled. Should I deploy IPv6 on on top of PPPoE ? or directly on ethernet ifces ? should I ask my CPE vendors to break the strict RFC behavior ( for MS clients)? Cheers, Dimitris On 27/7/2011 5:26 μμ, Ivan Pepelnjak wrote: <blockquote cite="mid:004a01cc4c69$2952a1a0$7bf7e4e0$@info" type="cite"> <pre wrap="">There's a minimum timeout of 2 hours hard-coded in the SLAAC RFC to prevent DoS attacks. Some details here: <a class="moz-txt-link-freetext" href="http://blog.ioshints.info/2010/12/small-site-multihoming-in-ipv6-mission.html">http://blog.ioshints.info/2010/12/small-site-multihoming-in-ipv6-mission.html</a> Then there's the failure to detect PPPoE session loss: <a class="moz-txt-link-freetext" href="http://blog.ioshints.info/2010/10/dhcpv6-over-pppoe-total-disaster.html">http://blog.ioshints.info/2010/10/dhcpv6-over-pppoe-total-disaster.html</a> Last but definitely not least, CPEs tend to copy lease time from DHCPv6 PD to SLAAC prefix validity time (and I found no way to change that behavior in Cisco IOS), so you either overload your DHCPv6 server by using short leases or risk having delegated prefixes that will stay in the customer's CPEs for a long time. Ivan </pre> <blockquote type="cite"> <pre wrap="">-----Original Message----- From: <a class="moz-txt-link-abbreviated" href="mailto:ipv6-wg-admin@ripe.net">ipv6-wg-admin@ripe.net</a> [<a class="moz-txt-link-freetext" href="mailto:ipv6-wg-admin@ripe.net">mailto:ipv6-wg-admin@ripe.net</a>] On Behalf Of Tim Chown Sent: Wednesday, July 27, 2011 4:08 PM To: ipv6-wg Subject: Re: [ipv6-wg] dynamic or static IPv6 prefixes to residential customers On 27 Jul 2011, at 14:45, Ivan Pepelnjak wrote: </pre> <blockquote type="cite"> <pre wrap="">Unfortunately you have to do static prefix delegation because it's </pre> </blockquote> <pre wrap="">impossible to renumber the customer's inside LAN within a reasonable time interval with today's state of IPv6 SLAAC. Why impossible? Tim </pre> </blockquote> <pre wrap=""> </pre> </blockquote> <pre class="moz-signature" cols="72">-- ------------------------ Dimitrios K. Kalogeras Electrical Engineer Ph.D. Network Engineer Netmode NTUA Lab _____________________________________ skype: aweboy voice: +30-210-772 1448 fax: +30-210-772 1866 e-mail: <a class="moz-txt-link-abbreviated" href="mailto:D.Kalogeras@noc.ntua.gr">D.Kalogeras@noc.ntua.gr</a> </pre> </body> </html>