[ipv6-wg] dynamic or static IPv6 prefixes to residential customers

Ivan

My understanding is that while a previous prefix cannot be removed by setting the lifetime to 0 (for the reason you cited) it can be deprecated instantly by setting the preferred timer to 0. Which has the same net effect of using the new prefix.

-éric

> -----Original Message-----
> From: ipv6-wg-admin at ripe.net [mailto:ipv6-wg-admin at ripe.net] On Behalf Of
> Ivan Pepelnjak
> Sent: mercredi 27 juillet 2011 10:26
> To: 'Tim Chown'
> Cc: ipv6-wg at ripe.net
> Subject: RE: [ipv6-wg] dynamic or static IPv6 prefixes to residential
> customers
> 
> There's a minimum timeout of 2 hours hard-coded in the SLAAC RFC to prevent
> DoS attacks. Some details here:
> 
> http://blog.ioshints.info/2010/12/small-site-multihoming-in-ipv6-mission.html
> 
> Then there's the failure to detect PPPoE session loss:
> 
> http://blog.ioshints.info/2010/10/dhcpv6-over-pppoe-total-disaster.html
> 
> 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
> 
> > -----Original Message-----
> > From: ipv6-wg-admin at ripe.net [mailto:ipv6-wg-admin at ripe.net] 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:
> >
> > > Unfortunately you have to do static prefix delegation because it's
> > impossible to renumber the customer's inside LAN within a reasonable time
> > interval with today's state of IPv6 SLAAC.
> >
> > Why impossible?
> >
> > Tim