[143297] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Owen DeLong)
Fri Aug 5 13:27:20 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <alpine.DEB.2.00.1108051827490.4709@uplift.swm.pp.se>
Date: Fri, 5 Aug 2011 10:22:53 -0700
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Aug 5, 2011, at 9:29 AM, Mikael Abrahamsson wrote:
> On Fri, 5 Aug 2011, Brian Mengel wrote:
>=20
>> 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.
>=20
> 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.
>=20
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.
>=20
> 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.
>=20
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?
>=20
> Yes, there are plenty of people with opinions.
>=20
> 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.
>=20
If you really want to do it right, go for /48=85 It works better.
Owen
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