[182372] in North American Network Operators' Group
Re: Dual stack IPv6 for IPv4 depletion
daemon@ATHENA.MIT.EDU (Doug Barton)
Wed Jul 15 17:02:16 2015
X-Original-To: nanog@nanog.org
To: nanog@nanog.org
From: Doug Barton <dougb@dougbarton.us>
Date: Wed, 15 Jul 2015 14:02:12 -0700
In-Reply-To: <27212.1436993290@turing-police.cc.vt.edu>
Errors-To: nanog-bounces@nanog.org
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On 7/15/15 1:48 PM, Valdis.Kletnieks@vt.edu wrote:
> On Wed, 15 Jul 2015 16:23:36 -0400, "Ricky Beam" said:
>
>> What seems like a great idea today becomes tomorrow's "what the f*** w=
ere
>> they thinking".
>
> However, this statement doesn't provide any actual guidance, as it's
> potentially equally applicable to the "give each end customer a /48" cr=
ew and
> the "Give them all a /56" crew.....
>
> Actually, not true - in fact, it's demonstrable that a residential cust=
omer
> can run through a /56. Just get a largish house, put up one router usi=
ng
> CeroWRT (or, I suspect a current/recent OpenWRT) that burns through 6-7=
subnet
> allocations), and then put a second one at the other end of the house a=
nd
> it burns through 6-7. The second one has to dhcp-pd request at least 3=
bits
> for itself, which leaves the first one only 5 bits, of which *it* will =
burn
> at least 3. If you create any VLANs at all, you just burned 4 and 4 bi=
ts,
> and there goes that /56.
>
> And that's burned all the subnets in a /56 *just hooking up 2 plug and =
play
> routers*. There's none left for doing anything experimental/different.=
>
> (And I suspect Dave Taht can provide several CeroWRT config checkboxes =
that
> will each burn another 1-3 bits each if you click on them and hit "appl=
y" :)
I tend to think that you're correct here, Validis; which is why I=20
suggest reserving the /48 per customer whatever they decide to assign. I =
think the problem of expanding the assignment to a more reasonable size=20
will happen on its own since at some point the support calls for "hey, I =
need more space!" will become a burden.
Doug
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