[143325] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Owen DeLong)
Sat Aug 6 05:26:18 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <3435B504-1C63-4717-8E5C-8CB35A02DF70@baycix.de>
Date: Sat, 6 Aug 2011 02:21:27 -0700
To: Sascha Lenz <slz@baycix.de>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Aug 6, 2011, at 12:47 AM, Sascha Lenz wrote:
> Hi,
>=20
>=20
>> Let's clarify -- /48 is much preferred by Owen, but most ISPs seem to =
be
>> zeroing in on a /56 for production. Though some ISPs are using /64 =
for
>> their trials.
>=20
>=20
> IIRC, there's RfC6177 - covering almost exactly what the original =
poster asked for.
> Not sure if it was mentioned already.
>=20
RFC6177 sort of appears to recommend /56 if you don't look at it too =
closely.
What it really says is essentially "The IETF throws its hands up in the =
air and
refuses to make any recommendations in this arena leaving the entire =
thing
to RIRs and service providers where we probably should have put it in =
the
first place."
> /48 is what IPv6 was designed for, /48 per customer (or even per =
customer-site some might say) is supported by the RIR policies,
> and there are close to zero reasons not to use a /48. It also eases =
your administration
> processes and also operational things.
>=20
AMEN, Brother! ;-)
> Of course, if you only have John Average residential customers or =
whatever, use a /56 or /60.
> It's your choice. You know your customers best. We're not in a =
classful world again :-)
> But do your math, there is no address shortage, handing out a /48 to =
every type of customer
> as a single assignment size should be the sane choice.=20
> You waste precious time thinking too much about it.
>=20
Yep. Even if you only have John Average residential customer. =
Residential customers today are
not going to be the same as residential customers in 5, 15, or 25 years. =
Giving them /48s will save
you (and them) a lot of heartache down the road. (and yes, I mean a /48 =
per end site structure or
per tenant in a multi-tenant structure).
> At least don't make your life miserable by experimenting with too many =
different assignment sizes,
> or advocate /64s or something, that's considered a design fault which =
will come back to you some day.
> Read the RfCs and RIR policy discussions in the archives some years =
ago.=20
>=20
Also, please don't make your life miserable by trying to align things on =
odd bit boundaries. Stick
to nibbles.
Owen
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