[Re: http://tools.ietf.org/search/draft-hain-ipv6-ulac-01]

[morrowc.lists at gmail.com (Christopher Morrow)]

On Wed, Apr 21, 2010 at 9:35 PM,  <Valdis.Kletnieks at vt.edu> wrote:
> On Thu, 22 Apr 2010 07:30:51 +0930, Mark Smith said:
>
>> " ?The following table shows the probability of a collision for a range
>> ? ?of connections using a 40-bit Global ID field.
>>
>> ? ? ? Connections ? ? ?Probability of Collision
>>
>> ? ? ? ? ? 2 ? ? ? ? ? ? ? ?1.81*10^-12
>> ? ? ? ? ?10 ? ? ? ? ? ? ? ?4.54*10^-11
>> ? ? ? ? 100 ? ? ? ? ? ? ? ?4.54*10^-09
>> ? ? ? ?1000 ? ? ? ? ? ? ? ?4.54*10^-07
>> ? ? ? 10000 ? ? ? ? ? ? ? ?4.54*10^-05
>>
>> ? ?Based on this analysis, the uniqueness of locally generated Global
>> ? ?IDs is adequate for sites planning a small to moderate amount of
>> ? ?inter-site communication using locally generated Global IDs."
>
> There is a measured rate by RIRs and the like on the order of 10^-6 for
> accidentally issuing duplicate integers (roughly approximated by 2 cases of
> duplicate ASNs out of (300K routes + 30K ASNs). ?In other words, unless you
> have over 1,000 or so backdoor links, you're more likely to get screwed over by
> an administrative drone fscking up your paperwork than you are of a statistical
> collision.

it's not about the frequency of collision, it's about the cost to
rectify one/two/some.

and the complexity this adds to every host/router/device in/around the
network (dns, firewalls, acls, etc... icky)

-chris