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Re: IPv6 traffic stats

Harald Alvestrand <harald@alvestrand.no> Wed, 12 November 2008 10:06 UTC

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Date: Wed, 12 Nov 2008 11:06:35 +0100
From: Harald Alvestrand <harald@alvestrand.no>
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To: Pekka Savola <pekkas@netcore.fi>
Subject: Re: IPv6 traffic stats
References: <08111108201165.2a71d.487911088@oregon.uoregon.edu> <20081111185711.GG1588@nsn.com> <4919ED2F.2020101@alvestrand.no> <f1110c510811111249ud4ee387m2169fb84378ec3f4@mail.gmail.com> <4919FA68.4030803@alvestrand.no> <alpine.LRH.2.00.0811120747470.11163@netcore.fi>
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Pekka Savola wrote:
> On Tue, 11 Nov 2008, Harald Alvestrand wrote:
>> The correct number from the presentation is 0.238% - only Russia, 
>> Ukraine and France have more than 0.5% IPv6.
>>
>> Presentation available from 
>> http://rosie.ripe.net/presentations-detail/Thursday/Plenary%2014:00/index.html. 
>>
>
> Depends on what you're looking for, but if you are interested in the 
> amount of users that have any kind of IPv6 connectivity, this 
> undercounts severely because address selection rules on recent OSs 
> typically select IPv4 if their connectivity is 6to4 or Teredo.
Pekka,

can you identify the OSes that prefer IPv4 when on 6to4, and pointers to 
docs?

Steinar (the guy who did the Google experiment) has tried to dig through 
the documentation on both Vista and Linux, and has drawn a blank (Vista 
with Teredo doesn't even look up the AAAA record if it has IPv4 
connectivity, according to the documentation, so it seems that it will 
not use IPv6 to IPv6-only hosts; it will never find the address.)

                Harald

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