[125732] in North American Network Operators' Group
Re: [Re: http://tools.ietf.org/search/draft-hain-ipv6-ulac-01]
daemon@ATHENA.MIT.EDU (Christopher Morrow)
Thu Apr 22 01:52:51 2010
In-Reply-To: <9031.1271900128@localhost>
Date: Thu, 22 Apr 2010 01:51:51 -0400
From: Christopher Morrow <morrowc.lists@gmail.com>
To: Valdis.Kletnieks@vt.edu
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, Apr 21, 2010 at 9:35 PM, <Valdis.Kletnieks@vt.edu> wrote:
> On Thu, 22 Apr 2010 07:30:51 +0930, Mark Smith said:
>
>> " =A0The following table shows the probability of a collision for a rang=
e
>> =A0 =A0of connections using a 40-bit Global ID field.
>>
>> =A0 =A0 =A0 Connections =A0 =A0 =A0Probability of Collision
>>
>> =A0 =A0 =A0 =A0 =A0 2 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A01.81*10^-12
>> =A0 =A0 =A0 =A0 =A010 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A04.54*10^-11
>> =A0 =A0 =A0 =A0 100 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A04.54*10^-09
>> =A0 =A0 =A0 =A01000 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A04.54*10^-07
>> =A0 =A0 =A0 10000 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A04.54*10^-05
>>
>> =A0 =A0Based on this analysis, the uniqueness of locally generated Globa=
l
>> =A0 =A0IDs is adequate for sites planning a small to moderate amount of
>> =A0 =A0inter-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). =A0In other words, unless=
you
> have over 1,000 or so backdoor links, you're more likely to get screwed o=
ver by
> an administrative drone fscking up your paperwork than you are of a stati=
stical
> 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
