[125909] in North American Network Operators' Group
Re: [Re: http://tools.ietf.org/search/draft-hain-ipv6-ulac-01]
daemon@ATHENA.MIT.EDU (Stephen Sprunk)
Mon Apr 26 10:21:10 2010
Date: Mon, 26 Apr 2010 09:20:30 -0500
From: Stephen Sprunk <stephen@sprunk.org>
To: North American Noise and Off-topic Gripes <nanog@merit.edu>
In-Reply-To: <20100425113106.6b12817c@opy.nosense.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On 24 Apr 2010 21:01, Mark Smith wrote:
> On Thu, 22 Apr 2010 01:48:18 -0400
> Christopher Morrow <morrowc.lists@gmail.com> wrote:
> =20
>> On Wed, Apr 21, 2010 at 5:47 PM, Mark Smith
>> <nanog@85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org> wrote:
>> =20
>>> So what happens when you change providers? How are you going to keep =
using globals that now aren't yours?
>>> =20
>> use pi space, request it from your local friendly RIR.
>> =20
> I was hoping that wasn't going to be your answer. So do you expect ever=
y residential customer to get a PI from an RIR?
> =20
The vast majority of residential customers have no idea what "globals"
or "PI" are. They use PA and they're fine with that--despite being
forcibly renumbered every few hours/days. (Many ISPs deliberately tune
their DHCP servers to give residential customers a different address
each time for "market segmentation" reasons.)
> Here's the scenario:
>
> I'm a typical, fairly near future residential customer. I have a NAS th=
at I have movies stored on. My ISP delegates an IPv6 prefix to me with a =
preferred lifetime of 60 minutes, and a valid lifetime of 90 minutes. ...=
I start watching a 2 hour movie, delivered from my NAS to my TV over IPv=
6, using the GUA addresses (because you're saying I don't ULAs). 5 minute=
s into the movie, my Internet drops out.
And five minutes and a few seconds into the movie, the movie drops out
because the DRM mechanism can't phone home anymore to validate you still
have a license to watch it. I have an IP-based DVR, and that's exactly
what happens.
However, let us look forward to a world where the TV/movie studios have
woken up to the fact that DRM does more harm than good, as the record
industry recently has:
> 1 hour, 35 minutes into movie, the movies drops out, because the IPv6 a=
ddresses used to deliver it can't be used anymore.
The vast majority of residential customers have a single subnet, so they
can get by just fine using IPv6 link-local addresses. The vanishingly
small percentage that have multiple subnets are presumably savvy enough
to set up ULA-R addresses. There is no need for ULA-C in this scenario.
The only semi-rational justification for ULA-C is that organizations
privately internetworking with other organizations are scared of ULA-R
collisions. However, PI solves that problem just as readily. If one
cannot afford or qualify for PI, or one wants a non-PI prefix due to
delusions of better security, one can use a private deconfliction
registry, e.g. <http://www.sixxs.net/tools/grh/ula/>.
S
--=20
Stephen Sprunk "God does not play dice." --Albert Einstein
CCIE #3723 "God is an inveterate gambler, and He throws the
K5SSS dice at every possible opportunity." --Stephen Hawking
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