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Re: [Fwd: I-D Action: draft-carpenter-6man-ug-00.txt]

Mark Smith <markzzzsmith@yahoo.com.au> Wed, 06 February 2013 03:28 UTC

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References: <954FE2BB-69DB-4214-9696-0BA3DF6CF346@laposte.net> <510FF1F0.3030903@dougbarton.us> <92B7D8D3-3406-44D5-9802-8320AE32A62C@laposte.net> <20130205.150156.74693024.sthaug@nethelp.no>
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Date: Tue, 05 Feb 2013 19:28:53 -0800
From: Mark Smith <markzzzsmith@yahoo.com.au>
Subject: Re: [Fwd: I-D Action: draft-carpenter-6man-ug-00.txt]
To: "sthaug@nethelp.no" <sthaug@nethelp.no>, "despres.remi@laposte.net" <despres.remi@laposte.net>
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----- Original Message -----
> From: "sthaug@nethelp.no" <sthaug@nethelp.no>
> To: despres.remi@laposte.net
> Cc: ipv6@ietf.org
> Sent: Wednesday, 6 February 2013 1:01 AM
> Subject: Re: [Fwd: I-D Action: draft-carpenter-6man-ug-00.txt]
> 
>>  With these specifications, it is impossible on a SLAAC link that two hosts 
> that have universal-scope addresses (necessarily different if they communicate 
> at the MAC layer), would have conflicting IIDs at the IP layer if they derive 
> them from MAC addresses.
> 
> Impossible if the MAC addresses are indeed unique. That is correct for
> *almost* all cases. But not 100%.

So I emailed HD Moore, who did the research which produced this slide, showing volumes of duplicate MAC addresses by vendor.


https://speakerdeck.com/hdm/derbycon-2012-the-wild-west?slide=64


I asked him if he would be able sent me some info on the number of occurrences of duplication by MAC address. He sent me quite a bit of information, which I'll need to ask him how much he is willing for me to publish publicly. However, I'm confident that he'd be ok with the following.

Here is the top 10 list of occurrences of individual MAC addresses:

- 6987574
-  829787
-  787661
-  347282
-  292288
-  112580
-    95484
-    60295
-    60254
-    60125

Yes, that first number is 6 million.

This information was gleaned from NetBIOS Name Service information accessible over the Internet, so it is a subset of the possible actual numbers of duplicate MAC addresses.



> 
> Steinar Haug, AS 2116
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