Windows 7 and SLAAC?

[Marshall Eubanks]

On Mar 30, 2010, at 12:18 PM, Sam Wilson wrote:

>
> On 30 Mar 2010, at 12:54, David Horn wrote:
>
>> On Tue, Mar 30, 2010 at 7:27 AM, Gert Doering <gert at space.net> wrote:
>>>
>>> Hi,
>>>
>>> I did an IPv6 training for a customer today, and discovered  
>>> something
>>> interesting - Windows 7 doesn't use the MAC address of an interface
>>> for EUI64-based stateless autoconfiguration, but "something else".
>>> [snip]
>>
>>>
>> Microsoft has a "Cable Guy" article that describes Vista/Win 7
>> autoconf behavior, including the netsh CLI interface syntax for this
>> particular setting.
>>
>> netsh interface ipv6 set global randomize identifiers=disabled
>>
>> http://technet.microsoft.com/en-us/magazine/2007.08.cableguy.aspx   
>> for
>> more information.
>
> That's a very useful article.  I can't find in it (at a quick  
> glance) anything that says whether the random address generation  
> logic tries to generate the same (set of) random address(es) each  
> time it is initialised.  That would be a useful property for keeping  
> tabs on machines and would save the hassle of DDNS and the like.
>

I would assume that these are not constant.

RFCs 4941 describes "privacy extensions" that yield changing (pseudo)  
random interface IDs and RFC 5157 provides a background into why this  
is could be a good thing.

Regards
Marshall



> Sam
>
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>
>