On Aug 5, 2011, at 9:29 AM, Mikael Abrahamsson wrote: > On Fri, 5 Aug 2011, Brian Mengel wrote: > >> In reviewing IPv6 end user allocation policies, I can find little >> agreement on what prefix length is appropriate for residential end >> users. /64 and /56 seem to be the favorite candidates, with /56 being >> slightly preferred. > > Not slightly preferred, very much preferred. /56 is future proof and works > for "everybody". /64 is short sighted and doesn't allow for multiple networks > in the home. > I would say /56 is slightly preferred and that /48 is very much preferred.
>> I am most curious as to why a /60 prefix is not considered when trying >> to address this problem. It provides 16 /64 subnetworks, which seems >> like an adequate amount for an end user. > > Why save on addresses, you can just get more IPv6 addresses if you need them. > /56 is allowed per user from all the RIRs afaik. > All RIRs allow /48s actually. Some policies measure in increments of /56, BUT, even those policies consider issuing a customer a /48 to be a valid use of 256 /56s for measurement purposes. >> Does anyone have opinions on the BCP for end user addressing in IPv6? > > Yes, there are plenty of people with opinions. > > This has been hashed over and over and over again, please check the archives > for lots of discussions on pros an cons. If you want to do it right, go for > /56, it works. > If you really want to do it right, go for /48… It works better. Owen
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