[155013] in North American Network Operators' Group
Re: using "reserved" IPv6 space
daemon@ATHENA.MIT.EDU (valdis.kletnieks@vt.edu)
Thu Jul 19 14:30:26 2012
To: Saku Ytti <saku@ytti.fi>
In-Reply-To: Your message of "Wed, 18 Jul 2012 21:07:35 +0300."
<20120718180735.GA11403@pob.ytti.fi>
From: valdis.kletnieks@vt.edu
Date: Thu, 19 Jul 2012 14:29:14 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
--==_Exmh_1342722554_2295P
Content-Type: text/plain; charset=us-ascii
On Wed, 18 Jul 2012 21:07:35 +0300, Saku Ytti said:
> If collision occurs, if dispute occurs, provability that one party did not
> use BCP method can be useful to solve dispute and decide who renumbers.
Looking at actual numbers out of RFC4193:
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
OK? So even if you merge and re-merge, and go on a massive buying spree and
accumulate a network where you have to interoperate 1,000 ULAs, you're *still*
looking at a literally million-to-one shot. And if you only have a mess of 100 ULAs,
it's a billion-to-one.
Now, compare that to the chances that you'll acquire 2 companies, both of whom
had an employee who didn't actually generate a proper random number, but did
this sort of thing instead:
http://www.spinics.net/lists/linux-driver-devel/msg26431.html
A lot of people are worrying about the wrong problem.
--==_Exmh_1342722554_2295P
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Exmh version 2.5 07/13/2001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=4DV+
-----END PGP SIGNATURE-----
--==_Exmh_1342722554_2295P--
